More than 800 million people around the world use the social media video platform TikTok. However, some governments around the world are concerned that the Chinese-owned app allows the Chinese government to access people's data.

How can one brother travel into space and return younger than his twin? In just sixty seconds, a startling side effect of Einstein’s Theory of Relativity is explained to us.

Can planet Earth survive? Can we survive as a species? Changes in population growth could be a key factor to allowing us to prosper and live in harmony with nature once again.

Irene (Uma Thurman) learns the truth about Vincent's (Ethan Hawke) identity.

In a nearby nest, another pair of eagles have managed to raise two young. But with survival at stake, the younger chick must fend off a vicious assault from its older sibling. Eagle-owls are also nesting on the mountainside. Ducks, hares, rats, hedgehogs, and even ravens make up the diet of these fierce nighttime hunters.

"Supalonely" ("Supa" is how some people pronounce the adjective "super") is a song by New Zealand singer Benee featuring American singer Gus Dapperton. Rolling Stone writes: "Benee may have written “Supalonely” about a toxic relationship, but it’s evolved into a perfect alt-pop quarantine anthem."

The rivalry between Vincent (Ethan Hawke) and Anton (Loren Dean) comes to a head in one final competition.

Deborah Koehn is an internationally renowned Yoga Guru who has taught everyone from top movie stars to villagers at over 17,000 ft in the Peruvian Andes, to 7th generation Balinese priests. Her teaching philosophy encompasses everyone from the beginner yogi to the top practitioners of medical facilities and yoga studios.

You might have thought that “rock, paper, scissors” was a game of sheer chance, but scientists have shown that people play with a “predictable irrationality,” and that there are strategies that can help you to win.

Comedian Trevor Noah, who now hosts the Daily Show, compares the differences between England and Africa when it comes to obeying traffic lights. In particular, he doesn't understand why people in England are so obsessed with pressing the button in order to get the "walk" signal.

Things are calmer now in the Alps than two and a half million years ago, when the collision of two great continental plates forced them skywards. But even the splendid summer flowers, which bloom briefly in the high pastures, must be able to withstand a sudden outbreak of winter, cold mountain winds and a flurry of snow.

In late summer, the ibex are feeding in the high pastures, preparing for the winter ahead. The young males jostle and clash horns, testing their strength in a series of energetic show fights. As night falls, we catch glimpses of the powerful red deer, and Biker the eagle takes flight in an effort to coax her chick into the air.

Biker’s chick is strong enough, but lacks the courage to fly the nest. She must use food to tempt it into flight. The nest will then be empty, and other species can make use of its strength and secure position to raise their broods.

As the situation worsens, officials at the CDC repent and Nick is forced to kill in self-defense.

Sheldon and Amy film their first episode of "Fun with Flags," a show about "the dynamic world of vexillology." However, they keep getting interrupted by Sheldon's roommate Leonard.