This ancient mathematical trickery posits that a mighty hero cannot overtake a tortoise. Zeno of Elea (born c. 490 BCE) is the author of this and other paradoxes.

The video starts with information about coastal geology and the evolution of birds. It includes amazing footage of white storks, wildebeest, as well as zebras in East Africa's Serengeti region.

World Wildlife Fund: Making sustainability a priority, the Marshik Dairy — a fifth-generation family farm — implemented a new, technologically advanced and energy efficient barn design for their 155 cows. The new design included robotic milking facilities, energy efficient lighting and ventilation, and renewable wind and solar power.

The musical takes shape as Coldplay and the Game of Thrones cast continue to rehearse the songs. But just when they are ready to do their premier performance, there's a bit of a snag.

California sea lion communication, mating habits, and past and present threats to their survival are discussed. This segment additionally features amazing aerial photography of their rocky coastal habitats.

Here's a video from the World Wildlife Fund. Traditionally, anaerobic digester systems have not been practical on small dairy farms, but this didn’t stop Sensenig Dairy, a 100-cow farm, from pursuing its goal. Then Sensenig teamed up with the local community to collect enough waste to produce 1,401,600 kilowatt hours of electricity per year from "trash" that would otherwise end up in a landfill.

According to Mabel, this catchy tune is all about being strong and saying "no, you had your chance", to someone who took you for granted, but is still trying to get back in touch when the relationship is over. She’s had enough and walked away, and seems more than happy with the decision! Mabel is the daughter of world famous singer Neneh Cherry and is now making a huge name for herself in the music industry.

Marine mammals are the focus of this segment on coastal sea life. Humpback whales mostly swim along the coasts, whether in the Northern or Southern Hemisphere. Seals are semi-aquatic and try to stay as close to the coast as possible, though they'll search for prey in depths of up to forty meters.

Subscribers love playing Scribe, Yabla's patented dictation game. Once you've watched this brief video, you'll be playing in no time.

This is a trailer for the provocative 2011 romantic comedy Friends with Benefits. Set in New York City, it stars Justin Timberlake and Mila Kunis as two young business colleagues who naively imagine adding sex to their growing friendship will not lead to complications. Their friends are understandably skeptical!

Coldplay and the cast of Game of Thrones join forces for a sketch aired on the NBC TV charity campaign Red Nose Day to raise money to end child poverty.

We learn about the thousands of kilometers that humpback whales travel from their summer habitat in the polar regions to the tropical or subtropical waters where they spend the winter. Their multi-versed songs and the markings on their flukes are also discussed.

In a heartfelt cry for change and equality, 4 Non Blondes despair of the status quo and of the suppressive conventions they face up to in adult life. It’s hard to believe that this was their only major hit. What’s going on?!

Green sea turtles (the largest hard-shelled sea turtle) and whale sharks (the largest shark and fish overall) are featured in this segment. We also encounter a langouste, otherwise known as a rock lobster, and a moray eel lurking in their coral reef habitat.

Adam Levine and Christina Aguilera collaborate in this provocative clip from Maroon 5's third studio album Hands All Over. It reached the top of the charts world-wide in 18 countries in 2011-12. Enjoy!