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Breathtaking New Images Show Giant 'Claw Marks' on The Surface of Mars

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A Pair of Twins Grew Up in Different Countries, Then Scientists Compared Them

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Physicists Found a Way to Trigger The Strange Glow of Warp Speed Acceleration

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​The Arctic Ocean, photographed in the same place 105 years ago and today. Both photos were taken during the summer season.

Here is a link to the photographer Christian Aslund, this is his project.

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How Much Would It Cost to Build the Great Pyramid Today?

Even with cranes, helicopters, tractors and trucks at our disposal, it would be tough to construct the Great Pyramid of Giza today. Its construction 4,500 years ago is so astounding in some people's eyes that they invoke mystical or even alien involvement. But the current theory of the building of the Great Pyramid — the notion that it was assembled from the inside out, via a spiraling internal ramp — is probably still the best construction plan.

Following that plan, we could replicate the Wonder of the Ancient World for a cool $5 billion.

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Spooky Discovery on Mars Looks Just Like an Alien Doorway

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Hawaii's White Sand Beaches Are Made From Parrotfish 💩
In Hawaii, where beaches are constantly ranked the best in the world, a significant portion of that pristine, white, beautiful sand is actually poop.

Yep, 💩..
Parrotfishes, or uhu in Hawaiian, are key players in regulating algae and reef life. Their parrot-like beaks and fused-together teeth are used for scraping and biting dead coral, while additional teeth in their throats help to break it all down into sand. Snorkelers can actually hear them chomping or see the bite marks they leave on rocks.
Because parrotfishes don’t have stomachs, their meals pass straight through the long intestine, exploding in a cloud of sand out the backdoor. Larger parrotfish are like sand factories, producing as much as 840 pounds of sand per year.

The manatee's lip pads are movable! And it surprises.

Animals can grab various objects with them. Usually, they grab the vegetation they eat. But here, it seems, the manatee has confused the green hose with the plant.

How to unsee the two small handles on the nose of manatees? 😂

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ScienceAlert - Latest
Scientists Have Powered a Basic Computer With Just Algae For Over 6 Months

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These tiny orange glass balls are moon sand. Yes, sand from the moon magnified 340 times looks exactly like this. The Apollo 17 astronauts collected this "orange soil" on the rim of Shorty Crater in the Taurus-Littrow Valley.

This sand could have formed approximately 3.8 billion years ago during a volcanic eruption on the Moon.

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This is what the ancient Greek stadium looks like before and after the excavations.

Thousands of people filled this stadium thousands of times over the centuries, and then it all just stopped and overgrown. You won’t even think at first glance that there is a whole stadium under the grass.

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That’s how an ancient Egyptian door lock works. Not so different from a modern one, right? Pretty simple, but at the same time very thoughtful.

The general principle has not changed since that time. And I wonder if there were people who could easily pick such locks?

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Giraffes are just as astonishing on the inside as they are to look at. Standing up to 19 feet tall, they require enormously high blood pressure to pump blood up to the head, yet they suffer few, if any, of the consequences that people with high blood pressure would.

Giraffes have sky-high blood pressure because of their sky-high heads that, in adults, rise about six meters above the ground — a long, long way for a heart to pump blood against gravity. To have a blood pressure of 110/70 at the brain — about normal for a large mammal — giraffes need a blood pressure at the heart of about 220/180. It doesn’t faze the giraffes, but a pressure like that would cause all sorts of problems for people, from heart failure to kidney failure to swollen ankles and legs.

Giraffes have solved a problem with high blood pressure. Their solutions, only partly understood by scientists so far, involve pressurized organs, altered heart rhythms, blood storage — and the biological equivalent of support stockings.

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In ancient China, pillows were made from different materials. They took wood, bamboo and even jade, bronze and porcelain.

It was believed that a jade pillow makes a person smarter. Hard pillows were preferred precisely because of this belief. Although the Chinese knew how to make soft pillows, it was believed that they, on the contrary, steal energy while a person is sleeping.

On a picture you can see a Jin Dynasty ceramic pillow, beautiful but obviously uncomfortable.

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