Our friends at Numberphile provide a detailed look at how the game Connect Four is won or lost.

UNICEF Goodwill Ambassador Katy Perry delivers a special weather report on the devastating effects of climate change for the world’s children.

Why would a killer whale go after a great white shark? Enter Alisa Schulman-Janiger, a biologist who is very familiar with the different families of killer whales off the coast of California.

Justin Bieber headlined the 2015 Jingle Bell Ball in London, finishing his set with the song "Sorry."

Rosetta revisits the exciting scientific discoveries she has made during her time at Comet 67P/Churyumov-Gerasimenko, including the successful search to find Philae. Now it's time to start preparing to descend to the comet for the end of her extraordinary mission.

In this clip, an inept band of two seems well matched with their equally inept manager. Enjoy this hilarious skit by the New Zealand comedy duo Flight of the Conchords!

Today Lauren conducts another brief English lesson from London. In it she introduces the body's five senses and the parts of the body that are associated with each one. Enjoy!

This original rap music video celebrates the "Java Life".
Dedicated to the developer homies everywhere who code hard day and night.
Think Java programmers meet street Hip Hop.

These DIY hatching chick deviled eggs for Easter are the perfect dish to serve this spring, and once you watch this video, you'll learn how easy they are to make. Just be careful, they're so adorable, everyone is going to want one of their own!

British actress Alice Eve discusses her experiences living in the United States and England both as a child and as an adult, demonstrating both accents for Conan.

Sigrid introduces her series on English pronunciation and tells us why there isn't always just one "right" way to pronounce words.

Jessica is planning a trip to the Grand Canyon and is trying to find reasonably priced accommodation.

Pam’s Kitchen is in Seattle, Washington. In this clip, we meet the owner and discover the passion she has for the cuisine of her native Caribbean homeland.

Come listen as Bindni Karia, a woman working in film production in the Indian film industry in London, shares a bit about herself and the job she loves. Learn a bit about her hometown of Leicester, England, along with her love for London and the UK as a whole.

In the war zones of Liberia and Congo, four volunteers with Médecins Sans Frontières (MSF) struggle to provide emergency medical care under extreme conditions. With different levels of experience, each volunteer must find their own way to face the challenges, the tough choices, and the limits of their idealism.