Chris Isaak tells the story behind shooting the iconic 1989 music video for "Wicked Game," which featured supermodel Helena Christensen. The on-screen chemistry between the two of them has made many people wonder if they were romantically involved in real life, but Isaak says it was the combination of Christensen's excellent acting and the skill of photographer/director Herb Ritts that made the video come alive.

Eagle expert Andreas Mayrhofer climbs down to the empty eagle nest, where he will collect evidence of the eagles’ diet and habits. Autumn has arrived, spreading its mellow colors across the Alps. But this is no time to relax, and the eagles’ prey must be ever watchful. An escaped rabbit catches the eye of a hungry eagle.

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.

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

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.

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.

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.

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.

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.

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.

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

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.