Coupon: Huawei Mate 20 to 539 € instead of 799 € on Amazon

Coupon: Huawei Mate 20 to 539 € instead of 799 € on Amazon

The excelent Huawei Mate 20 has a nice discount this February 17. It is offered on Amazon at the price of € 539 instead of € 799 usually. Dispatched from and sold by Amazon.

This model features a 6.5-inch IPS LCD with a resolution of 2244 x 1080 pixels (381 dpi). Under the hood is a Kirin 980 processor with 8 cores (2.6 GHz), 4 GB of RAM, a 4000 mAh battery and 128 GB of storage. A nice machine that will run without any problems all the applications on the Google Play Store. It also incorporates a triple photo sensor at the rear: 2 MP / F / 1.8 + 16 MP / 2.2 + 8 MP / 2.4 f and 24 megapixels in the front.

If you are interested in this device at the price of 539 €, click on the link "enjoy this good plan" below to access the offer:

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The original lock that sealed the tomb of Tutankhamun in Egypt

Photo: Harry Burton (Metropolitan Museum of Art)

Imagine being an archaeologist who explores the ancient tombs of Egypt and find yourself with this intact lock of 3245 years. This was the image that greeted Howard Carter in 1923 as he prepared to enter the gold-covered chapel that led to Tutankhamun's sarcophagus for the first time.

This incredible photograph was taken by Harry Burton in 1923. It shows an intact seal made of rope that secured the doors of one of the four superimposed chapels of Tutankhamun's tomb. The seal of the necropolis represents the kneeling captives and Anubis, the jackal god of the dead.

The outer doors of the chapels had been opened and looted twice in antiquity, but the doors of the third chapel, which contained the royal sarcophagus, were still sealed, an indication that their contents would be intact.

The door was finally opened by the famous archaeologist and Egyptologist Howard Carter, which led to the discovery of a mine of ancient treasures.

But how could the rope last 32 centuries without falling apart? An article by Rare Historical Photos explains it:

The rope is one of the fundamental human technologies. Archaeologists have found two-layered ropes dating back to 28,000 years ago. The Egyptians were the first documented civilization to use specialized tools to make ropes. A key by which the rope lasted so long is not the rope itself, but the aridity of the air in the desert, which dries and preserves things. Another key is oxygen deprivation. The tombs are sealed to the outside. Bacteria can break things down while they have oxygen, but then they suffocate. It is not uncommon to find ropes, wood carvings, fabrics, organic dyes, etc. in Egyptian pyramids and tombs that would not have survived anywhere else in the world. The desert conditions of Egypt made it possible to preserve much more organic material than would otherwise have been possible. This contrasts with, for example, Mayan sites in Central America that are much more recent, but of which almost no organic material has been recovered. The main difference is the jungle in the face of desert conditions.

For some reason, the seal photo did not reach the original coverage of the National Geographic dig, but it was made public in 2003.

Confused with the resolution of your TV? What you should know about 1080p, 2K, UHD, 4K and 8K

When you go to buy a television, one of the numbers that are studied with more interest, just after the screen size and price, is the resolution. Unfortunately, one of the most confusing numbers.

Here are some of the most common questions that are asked about the resolution, along with our quick answers.

  • What does 4K mean? It depends, but usually 3,840 x 2,160 pixels.
  • What does UHD mean? It is synonymous with "ultra high definition", but basically it means 4K.
  • Do most current TVs have 4K resolution? At 50 inches and more, yes.
  • Does 4K mean that the image will be better than the one on my previous TV? Not necessarily.
  • If 4K is four times greater than 1080p, does that mean that 4K is 4320p? Do not.
  • Is it worth worrying about 8K? Do not.

Looking for more information about the TV's resolution? Lets start by the beginning.

What is the resolution?

The resolution, in terms of TV hardware, refers to the number of pixels that make up the image on the TV. A single pixel, or picture element, consists of a small dot on the screen.

There are numerous resolution options on flat screen TVs. The oldest, and many 32-inch models that are sold today, have a million or more pixels (720p). The newer and slightly larger TVs (usually 49 inches and smaller) have just over 2 million pixels (1080p). Even the newest and largest TVs (usually 50 inches and more, but also smaller models) have 8 million (for 4K Ultra HD). And the newer, larger and ridiculously expensive televisions have more than 33 million pixels (8K). So you'll have to look very closely, or take out a magnifying glass, to discern each one.


The 8K resolution offers four times the number of pixels than 4K (UHD). But before splurging, keep this in mind: there is very little content available to watch on 8K, and you need to be really close to the TV to appreciate the details.

Sarah Tew / CNET

The fact that one TV has a resolution higher than another does not always mean it looks better. It can be, but not always, and for reasons that have little to do with the resolution. A TV with better image processing (HDR), a better contrast ratio or better color will look better than a TV that only has more pixels.

Having said that, it is worth understanding the various resolutions used by television and other manufacturers. Here is a little more details.

Resolution of large-screen TVs

Resolution name

Vertical pixels x Vertical

Other names



7,680 x 4,320


Conceptual televisions

"Cinema" 4K

4,096 x [sin especificar]




3,840 x 2,160

4K, Ultra HD, Ultra High Definition



2,048 x [sin especificar]




1,920 x 1,200

Widescreen Ultra Extended Graphics Array

Monitors, projectors


1,920 x 1,080

Full HD, FHD, HD, High Definition, 2K

Televisions and monitors


1,280 x 720

HD, High Definition


4K or Ultra HD

Let's start with the top segment of the current television market: 4K. It is a good place to start because it allows us to touch the basic points of most of the confusion in terms of resolution.

The short version is this: in televisions, 4K and Ultra HD (UHD) are the same resolution. Those TVs, along with the Ultra HD Blu-Ray players, and almost all the UHD material in streaming of Netflix, Amazon and others, have a resolution of 3,840 x 2,160.

This is the long version:

The problem is that 4K means something different if it's about the TV in your home or in a projector in a movie theater.

Technically, 4K is a horizontal resolution of 4,096 pixels, established by Digital Cinema Initiatives (DCI). Because all the movies do not have the same image proportion; that is, the shape of the rectangle on the screen, the vertical resolution is not specified.

So things, it turns out that the pedants are right. Ultra HD TVs are not technically 4K, since their resolution is 3,840×2,160. However, that does not matter. 4K is easier to say than 2,160p or Ultra HD, and when anyone does a survey and asks about it, the vast majority of you, and we, prefer 4K. Google also prefers it and Amazon uses both.

This graphic shows the relative number of pixels in each of the most popular resolutions. The graph is not an exact visual representation, although it can be seen in its correct dimensions if you click on it ..

From highest to lowest: 4K Cinema, in proportion 1.78: 1 (black); UHD (white); 2K Cinema, in proportion 1.78: 1 (green); Full HD 1080p (red); 720p (blue).

Geoffrey Morrison / CNET

As the difference in pixels is 13 percent and almost impossible to see, we filed the issue in the "unimportant affairs" folder.

On the other hand, Sony's 4K projectors are 4K. The best image we have seen in a cinema was with a 4K projector with laser.

The 8K format follows the same logic. In the case of televisions, it is double the horizontal and vertical pixels of the 4K pixels: 7,680 x 4,320. This is not cinematic resolution, at least outside the experimental. We are beginning to see that 8K televisions reach the market, but it will be many years before this resolution is common.

Right now you can find 4K content in many places. Most major streaming services, such as Netflix, Amazon, iTunes and Vudu, have content available in 4K. There are also Blu-ray players and Ultra HD game consoles, such as the PS4 Pro and Xbox One X consoles. If you have a PC, most video cards in recent years can play video games in 4K. On the other hand, there is no American television in 4K. We'll have to wait until ATSC 3.0 for 4K. For cable and satellite television, there are some options, but this is just a couple of movie and documentary channels. That is, the primetime shows on ABC, CBS, NBC and Fox are not in 4K, and we do not know when they could be.


Before the 4K format became common, almost never talked about 2K. It was just a cinematic resolution, which is why it is sometimes used to refer to a "master format". Most of the projectors used in theaters are 2K resolution, some even less. The image has a width of 2,048 pixels, and the vertical resolution is not specified.

But now that the term 4K has been popularized to describe TVs and content, 2K becomes an abbreviation of the 1080p resolution that most HDTVs have, as well as Blu-ray. It is not technically accurate, but that did not stop 4K from becoming more popular than UHD.

1080p or Full HD

Remember when we talk about the cinematographic resolutions that only specify the horizontal resolution?

Well, on the other hand, TVs have historically used the vertical to describe the resolution, something that started with glass tube devices. So 1080p is the vertical resolution. Almost all high definition televisions have a ratio of 1.78: 1 (16×9, ie, "wide screen"), so that means a horizontal resolution of 1,920 pixels (1,920 x 1,080).

This is another source of confusion, because for many years we have talked about vertical resolution on television sets, and then, suddenly, we are talking about 4K TVs, which refers to horizontal resolution. Do not blame me, it was not my idea.

That means that 1080p is not 1K, but 2K, in the same way that ultra high definition TVs are 4K, which is to say that, with 1,920 x 1,080, they are close to the 2K DCI definition of 2,048. That said, most people do not say 2K to 1080p format, they call it 1080p or Full HD.

By the way, 1080i is the same resolution as 1080p, but these days it is indicated only as a resolution of material, not the TV. There are no longer 1080i TVs, but many HD stations are still 1080i.


This is approximately half of the 1080p pixels. Only the smallest and cheapest televisions are 720p. However, ABC, Fox, ESPN and its affiliate stations broadcast at 720p. This goes back to the initial transition to high definition at the beginning of this century.


In the world of computers an incomprehensible combination of letters is used to describe the resolution. Which is not surprising when it comes to computers.

I started assembling my own computers since the early 90s, and I can not tell you what those letters mean. I can understand that initially they were implemented to make things easier, but now there are so many resolutions that it is simply annoying.

Basically, the most popular are FHD (1,920 x 1,080) and WUXGA (1,920 x 1,200). The rest you can see in this graphic.

Fortunately, the only time that most of you will find yourself in this confusion is if you are looking for a cheap data projector or a computer monitor.

There are also computer monitors that have unique resolutions such as 5K (5,120 x 2,880) or 21: 9 aspect ratios. ultrawidescreen with extravagant resolutions like 3,440 x 1,440 pixels. There are so many variations that we could not talk about all of them.

samsung-cf791 "height =" 0 "width =" 970 "data-original =" 2f38c45e4522 / samsung-cf791-34.jpg "/></span><noscript><span><img src=

The CF791 widescreen monitor from Samsung has 3440 x 1440 pixels or UW-QHD (Ultra Wide Quad HD) resolution.

Sarah Tew / CNET

In conclusion

At the end of the day, this is what matters: your TV, unless it is new, is HD, 1080p. The new televisions are 4K Ultra H, and have four times more pixels than 1080p. Someday you can have an 8K TV or even a 10K, but we are still far from that.

But more pixels do not necessarily mean a better image. There are other aspects of image quality, such as contrast and color, which are much more important than resolution.

In the future, the resolution may become irrelevant. Technologies such as MicroLED separate size and resolution, so your future 50-inch TV could have a radically different resolution than the 100-inch TV in your living room, unlike now where both can have a 4K resolution with different pixel sizes . And one could be a projector. However, thanks to the advances in video processing, this will not matter. All will be seen in great detail.

Editor's note: This article was updated on February 15, 2019 to include new information and progress.

Good deal: the Samsung Galaxy J3 passes only 99 € this February 17

Good deal: the Samsung Galaxy J3 passes only 99 € this February 17

If it represents the entry-level Korean manufacturer, the Samsung Galaxy J3 is pleasant smartphone that is pleasant in hand, but also to the eye. Samsung had the good idea to integrate a 5-inch HD screen, the rendering is very correct. Another good point, the autonomy of the device that borders with 15 hours.

For the rest of the specifications, there is a quad core processor clocked at 1.4 Ghz, supported by 2 GB of RAM and 16 GB of internal storage (expandable via micro SD). A camera with 13 megapixels on the back and 5 megapixels on the front. Finally, it is 4G compatible and has a battery of 2400 mAh.

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A new study links the daily consumption of dietary drinks with strokes

Photo: eskaylim (iStock)

Bad news for those who have been taking diet soda under the belief that they are healthier than regular sodas. A new study by the American Heart Association says that "drinking two or more drinks artificially sweetened daily is related to an increased risk of strokes caused by clots, as well as heart attacks and premature death in American women over 50 years".

The study followed 80,000 women for more than 11 years after asking them how often they consumed diet drinks. Taking into account elements on the lifestyle of these women, the study found that "those who consumed two or more artificially sweetened beverages each day had a 31% greater chance of suffering a stroke caused by clots, 29% more likely to suffer from heart disease and 16% more chance of dying from any cause than women who drank diet drinks less than once a week or never. "

The result is frightening, but the AHA cautions that the study only points to observational connections between diet drinks and these results, not a causal relationship. As the study's lead author, Yasmin Mossavar-Rahmani, associate professor of clinical epidemiology and population health at the Albert Einstein School of Medicine in the Bronx, reflects: "What's wrong with these diet drinks? Is it something in sweeteners? Are they doing something to our intestinal health and metabolism? These are questions for which we need an answer. " But if you think your problems will be resolved by rejecting artificial sweeteners, a study conducted a few months ago by the British Medical Journal I found a connection between soft drinks with sugar and the development of diabetes.

We could start drinking sparkling water, but if someone comes up with a study that points to the danger of carbonation, we would be in big trouble.

An AI capable of creating hyper-realistic faces of people who do not exist

An AI capable of creating hyper-realistic faces of people who do not exist

GPU maker Nvidia has unveiled an artificial intelligence capable of making false human portraits (like the one just above) as realistic as they are frightening, reports The Next Web. To generate these faces, the Californian company relies on "generative antagonistic networks" or "GAN". Behind this somewhat barbaric name lie some rather interesting artificial intelligence algorithms. Here's how it works:

A first program is based on a base of photos to cross different faces and create a new, completely artificial. Then, a second program checks the coherence and makes sure that the face displays a sufficient degree of realism. If the result is not satisfactory, the operation starts again. The GANs were developed in 2014 by Ian Good Fellow, an engineer working at Google. they are used in different fields, but especially in video games.

To give you an idea of ​​the result, visit the website: ("this person does not exist" in French). The page displays a unique fake face, created by the AI, and each time you refresh, the site makes a new, totally artificial face. Impressive.

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Eight Sleep's smart pod Pod heats or cools your mattress

If you have trouble keeping a comfortable temperature while you sleep, Eight Sleep may have the solution: the Pod. This smart bed carries a lot of built-in technology and is available for US $ 2,495 in size king, US $ 2,195 in size what in and US $ 1,995 in size full.

The Pod is "the first bed that combines dynamic temperature regulation, biometric monitoring, integration with the smart home and sleep aid," according to the Eight Sleep press release.

An "active grid layer" that is integrated into the mattress contains Pod sensors and other monitoring technology. In addition to monitoring your sleep statistics and knowing more about your sleeping habits, it is also supposed to automatically adjust the temperature of the bed, based on your circadian cycles.

The Pod varies between 55 and 110 degrees Fahrenheit (between 12 and 43 degrees Celsius). If you do not want to adjust the temperature automatically, you can change it manually.

Its "thermal alarm" function is designed with the intention of awakening you in a more natural way than a standard alarm clock, cooling the bed before your set wake-up time.

Each bed has two zones and is designed to adjust each side independently.

You can see how you sleep in the app and get advice on how to improve the quality of your sleep. The Eight Sleep Pod is compatible with IFTTT, which means it will work with devices such as Nest, Philips Hue bulbs and Amazon Alexa speakers or speakers.

Watch this:

We have a smart house, do you want to see it?


You can already request a Pod in advance for a price of US $ 95. The rest must be paid when the bed starts shipping from April.

Map with the distance traveled by the rover Opportunity on Mars

Photo: NASA / JPL-Caltech

Of rover Opportunity, now officially dead, I am still surprised by one fact in particular: he traveled 45 kilometers on the surface of another planet, and he did it in desperately short stretches. It is possible that after 14 years of mission, the 45 kilometers do not seem like much, but keep in mind all the obstacles that Oppy faced, including the agonizing 38-day period that spun its wheels on a soft sand dune.

Opportunity traveled exactly 45.16 kilometers on the Martian surface. That's more than the distance traveled by the lunar rover Apollo 17 (35.73 kilometers), the Soviet rover Lunokhod 2 (38.62 kilometers), the Curiosity rover (19.79 kilometers) or the companion of Opportunity, the rover Spirit (7.72 kilometers). On the way, he took pictures of vast planes, sand dunes and craters, and found evidence that there is water on the Red Planet.

The incredible Oppy ride
Photo: James 919 (Wikimeda Commons)

It is not easy to drive a rover through Mars. Engineers can not control it in real time due to the 20 minute delay in communications. If Oppy started to slide towards a cliff, for example, engineers could not send commands to stop it until it was too late. Therefore, they have to send commands to move a short distance, take new data, re-evaluate and then send new commands. As NASA itself describes in an informative page, moving Oppy is a laborious process.

The rover and his team also overcame many technical failures related to steering, heat units and on-board memory. On the other hand, strong Martian dust storms threatened the rover, covering its solar panels with debris and depriving it of its energy source.

Perhaps the best example of the challenges that Oppy faced were the 38 Martian days he spent stuck in a dune, unable to get the traction necessary to get out of the soft sand. After more than 190 meters of carefully planned wheel rotations, the team was finally able to push the vehicle and continue its journey forward.

In the end, what ultimately defeated the rover was not a sand dune but a massive dust storm. Even so, the mission was a great success that revolutionized our understanding of Mars. During his long trips, Opportunity captured a wide variety of strange and wonderful images of the Red Planet. Next, I have compiled some of my favorite postcards of the great adventure of Oppy.

The first color panorama made by the rover
Photo: NASA / JPL-Caltech / Cornell
A rock found by Oppy in sun 346; it was determined to be a meteorite
Photo: NASA / JPL-Caltech / Ryan F. Mandelbaum
The desolate landscape of sand dunes in which Oppy got stuck
Photo: NASA / JPL-Caltech / Ryan F. Mandelbaum
The landscape around the Erebus crater during the Martian day 758
Photo: NASA / JPL-Caltech / Ryan F. Mandelbaum
Oppy leaves the Victoria crater
Photo: NASA / JPL-Caltech
Oppy's long walk between Victoria and Endeavor
Photo: NASA / JPL-Caltech
The edge of the Endeavor crater
Photo: NASA / JPL-Caltech
A pile of rocks inside the Endeavor crater
Photo: NASA / JPL-Caltech / Ryan F. Mandelbaum
Dust attenuates sunlight
Photo: NASA / JPL-Caltech

RED vs SFR vs Free Mobile: who has the best mobile plan at 10 € right now?

RED vs SFR vs Free Mobile: who has the best mobile plan at 10 € right now?

The operators without commitment are always very aggressive on the market heart of the package without commitment, offers 10 euros. And on this very affordable price range (and therefore volume for operators), RED by SFR and Free Mobile continue their usual mano-to-mano with data or service. As usual, you can count on CNET France to decrypt the small lines, list the advantages / disadvantages and slip to your ear the most attractive offer currently.

On the left corner of the ring, SFR, the tailor of the promo that relaunches his offer RED Unlimited 40 GB to 10 € and offers the consultation of digital books, on the right corner, Free Mobile that extends almost his concert package 8 , 99 € including 50GB. Which will win the match of the best package without commitment to 10 euros of the weekend? Fight!

Duration and end date of promos

Before starting the match, remember that all these promotions do not have the same period of validity. Only RED by SFR is sold as "unlimited" with prices that will end only upon termination of the contract. At Free Mobile, the promotion will only be valid for 12 months, after one year the offer will return to its original price. Also note the end date of promotions of our challengers: RED by SFR, Monday, February 18 and Free Mobile, this Tuesday, February 19.

Free Mobile 50 GB in detail>

RED by SFR 40 GB in detail>

4G envelope and roaming

40 GB of Internet to use in the SFR-listed hex but 50 GB at Free Mobile, the latter takes the advantage on this point, considering that it is here colossal envelopes. Out of the hexagonal borders, this result is to contrast because if Free offers 4 GB, the flow will be clamped in 3G from the European Union and the DOM. In front and from these destinations, RED also offers 4 GB, but in 4G (if available).

Free Mobile Advantage

Unlimited voices / sms

RED by SFR and Free Mobile offer the same services listed voice with unlimited classics to fixed and mobile France Metropolitan and DOM (excluding Mayotte) and from Europe / DOM to France / Europe / DOM. SMS and MMS are unlimited in mainland France and from Europe and DOM listed SFR, while at Free SMS are unlimited in France, to the DOM and from Europe and the DOM.


The flows, the network

Free Mobile has a newer network that is logically more perfectible than the competition. According to the latest report by Arcep, SFR has a coverage of 97% of the population in 4G while Free covers 92% of the population. Covering the territory, regarding average flows, in large, medium or small agglo, Free is still behind the three incumbent operators and this even if it is catching up, especially on 4G flows in average agglomeration.

Advantage RED by SFR

RED is more balanced, but

Remember that to switch from one operator to another while keeping his phone number, you will have to get your RIO by dialing 3179 on your smartphone. Once your RIO is recovered, the new operator will take care of the portability of your number.

By counting the points, we find ourselves in a draw between the two competitors of the weekend. If Free offers a more extensive metro data envelope in France, roaming in Europe is constrained to 3G. Similarly, the cover is still perfectible at Free Mobile that is catching up (a little) on the unlimited SMS to the DOM.

Opposite, the RED by SFR offer is more balanced with 40 GB of data in France metro (more than enough for most users), 4 GB roaming in 4G and coverage more dense than Free. Similarly, remember that the more attractive rate of Free Mobile (€ 8.99 / month) will only be valid for one year while it is unlimited time at RED by SFR (€ 10 / month).

RED wins this match, however, if you want to test Free Mobile, it's always the right time with this offer without commitment strongly discounted.

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