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Spending very long periods of time in space has something in common with extreme endurance swimming: both can cause the heart to shrink. That's the conclusion of a study that compared the effects of astronaut Scott Kelly's year in space with a marathon swim by athlete Benoît Lecomte.

In 1983, two army officers stopped at a car rental office in Pasni, a small coastal town in south-west Pakistan. One of them asked the owner: "Do you have a good car? We have to take an Arab sheikh to Panjgur."

Artificial intelligence and machine learning exist on the back of a lot of hard work from humans. Alongside the scientists, there are thousands of low-paid workers whose job it is to classify and label data - the lifeblood of such systems.

Earthlings can breathe a sigh of relief after US space agency Nasa confirmed the planet was "safe" from a once-feared asteroid for the next 100 years at least. Nasa had deemed Apophis to be one of the most dangerous asteroids to Earth after its discovery in 2004.

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The ivory trade, loss of vital habitat and a deeper understanding of elephant biology have all combined to reveal a previously underestimated threat to Africa's elephants.

Anyone with a smartphone that uses facial recognition will know it does not really work with a mask on. That can be frustrating - but although masks have undoubtedly thwarted the facial-recognition industry, the technology has also adapted.

Thousands have flocked to a volcano in Iceland which erupted near the capital, Reykjavik. Lava started to burst through a crack in Mount Fagradalsfjall on Friday evening, in the first eruption of its kind in more than 800 years.

Truncatable Primes with Dr James Grime... Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ Dr James Grime is available for public talks. See his website: http://singingbanana.com More vid

The Matterhorn Ultraks is an international skyrunning competition held for the first time in 1982. It runs every year in Zermatt (Switzerland) in August, race valid for the Skyrunner World Series till 2010.[1]

Brady's view on people who write: "FIRST" - http://youtu.be/CmRh9tFYC68 More links & stuff in full description below ↓↓↓ Dr James Grime on the Pisano Period - a seemingly strange property of the Fibonacci Sequence. Available Brown papers: http://periodicvideos.blogspot.co.uk/2013/09/brown.ht

Trisecting angles and calculating cube roots was a big problem for Euclid and his cohorts. Discussed by Zsuzsanna Dancso at MSRI. More links & stuff in full description below ↓↓↓ TRISECT WITH ORIGAMI: http://youtu.be/SL2lYcggGpc CIRCLE THE SQUARE: http://youtu.be/CMP9a2J4Bqw Support us on Pat

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ https://www.patreon.com/pbsspacetime I have good news and bad news. Bad news first: two years ago we reported on the Crisis in Cosmology. Since then, it’s onl

It's a longstanding mystery: how Mars lost the water that flowed across its surface billions of years ago. Scientists now think they have an answer: much of it became trapped in the planet's outer layer - its crust.

For thousands of years, mathematicians were calculating Pi the obvious but numerically inefficient way. Then Newton came along and changed the game. This video is sponsored by Brilliant. The first 314 people to sign up via https://brilliant.org/veritasium get 20% off a yearly subscription. Happy P

David Wyatt has worked in public relations for more than 20 years, having worked his way up to become a senior vice-president at an Austin, Texas-based firm. He recognises his privileges as a straight white man whose education was paid for.   

A powerful hallucinogenic drug known for its part in shamanic rituals is being trialled as a potential cure for depression for the first time.Participants will be given the drug DMT, followed by talking therapy.

Not since the 1970s has there been such an important discovery from the Great War in France. In woods on a ridge not far from the city of Reims, the bodies of more than 270 German soldiers have lain for more than a century - after they died the most agonising deaths imaginable.

It could be a quick email to a colleague you dislike. Perhaps it’s some menial paperwork; a small tweak to a spreadsheet or an invoice that has to be filed.

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ https://www.patreon.com/pbsspacetime We know that gravity exerts its pull on light, and we have an explanation for why. Actually, we have multiple explanations

An adventure athlete who cycled the world and survived falling down a mountain in India has been killed by a bus near his home in northern Israel. Roei Sadan, known affectionately as "Jinji", was 39 years old.