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Researchers say they may have worked out why there is a natural loss of muscle in the legs as people age - and that it is due to a loss of nerves. In tests on 168 men, they found that nerves controlling the legs decreased by around 30% by the age of 75.

Those white lines in the sky trailing behind jet planes are puffy plumes of water vapour. But online, some have twisted them into evidence of a secret plot to control weather or poison the environment. Why are wild theories about contrails and other phenomena so persistent on social media?

Two monkeys have been cloned using the technique that produced Dolly the sheep. Identical long-tailed macaques Zhong Zhong and Hua Hua were born several weeks ago at a laboratory in China.

Facebook has defended itself against claims that using the site can damage wellbeing and mental health. In a blogpost, it said while there was evidence it could negatively affect mood, the way it affected people was determined by how they used it.

http://www.ted.com Why do people see the Virgin Mary on cheese sandwiches or hear demonic lyrics in "Stairway to Heaven"? Using video, images and music, professional skeptic Michael Shermer explores these and other phenomena, including UFOs and alien sightings. He offers cognitive context: In the a

How can many stupid things combine to form smart things? How can proteins become living cells? How become lots of ants a colony? What is emergence? This video was made possible by a donation by the Templeton World Charity Foundation. A huge thanks to them for their support and help over the last ye

The Travelers' Century Club is home to the world's most-travelled people - so what keeps them going? Bill Ashley is 79, but still remembers his first geography lesson.

To play this video you need to enable JavaScript in your browser.The mysteries of the pyramids have deepened with the discovery of what appears to be a giant void within the Khufu, or Cheops, monument in Egypt.

The British peer Arthur Balfour barely makes an appearance in UK schoolbooks, but many Israeli and Palestinian students could tell you about him.

Five hundred years ago, a young German monk began the Protestant Reformation, shattering the authority of the Catholic Church. Centuries later, there are signs that the churches have put aside their differences.

image copyrightReutersA British local newspaper received an anonymous call about "some big news" in the US, shortly before President John F Kennedy was assassinated, according to documents.A memo dated 26 November 1963 said the call was made to the Cambridge News at 18:05 GMT on 22 November 1963.

One of the last known letters to have been written on the Titanic has sold for a world record price at auction. The letter, written by American businessman and Titanic passenger, Oscar Holverson, fetched £126,000.

TV viewers of new BBC drama Trust Me, in which a nurse fakes it as a doctor, have been left wondering whether it could happen in real life. If you didn't catch it, Cath Hardacre, played by Jodie Whittaker, is sacked as a nurse so steals her best friend's identity to become a senior doctor.

Professor David Eisenbud on the famed Goldbach Conjecture. More links & stuff in full description below ↓↓↓ Catch David on the Numberphile podcast: https://youtu.be/9y1BGvnTyQA Extra footage from this interview: https://youtu.be/7D-YKPMWULA Prime Playlist: http://bit.ly/primevids Prime Num

It's called The Flow: A state of effortless concentration and enjoyment, where time just seems to melt away - and Tove Styrke has been getting a lot of it lately. In fact, the Swedish star has already lost five months to making her third album... and it's still not finished.

Only one in four men in the Arab world supports equality for women in some areas, and most still believe a woman's primary role is at home, a survey suggests.

Translators who have aided the U.S. Military in Afghanistan and Iraq are in great danger in their home countries, but red tape is making it impossible for many of them to leave. John Oliver interviews Mohammad, one translator who made it out. For more info on efforts to assist U.S.-affiliated refug

An Indonesian woman has been killed and swallowed whole by a 7m (23ft) long python, say local authorities. Though such incidents are incredibly rare, this was the second python death reported in Indonesia in just over a year.

Akbar went missing on Sunday on the island of Sulawesi, after leaving to harvest palm oil. In the search for the 25-year-old, police told BBC Indonesian that they had found a huge snake they suspected had swallowed the man.

As anyone who has ever eaten a really hot chilli will testify, they can cause a lot of pain.

William Lindesay has been obsessed with the Great Wall of China since seeing it in a school atlas as a child in England, and last year embarked on an epic journey to fulfil a lifelong ambition - to film the wall in its entirety from the air. He told the BBC's Anna Jones about this quest.

No victim has come forward. There's no investigation. And physical evidence? That doesn't exist either. But thousands of people are convinced that a paedophilia ring involving people at the highest levels of the Democratic Party is operating out of a Washington pizza restaurant.

We’re used to thinking hugely well of democracy. But interestingly, one of the wisest people who ever lived, Socrates, had deep suspicions of it. Enjoying our Youtube videos? Get full access to all our audio content, videos, and thousands of thought-provoking articles, conversation cards and mo

Treasure hunters have begun digging at a site in south-western Poland where they believe a Nazi train, laden with stolen gems and arms, is hidden. Experts say there is no evidence that the legendary train exists there.