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

Dana: Six funny ways you know you're in the U.S. that I noticed while back over there this past January.

Join Minoo and Rachel, who each have their own YouTube channel devoted to improving English pronunciation, as they come together to compare British and American English pronunciation.

So if an orca attacking a shark is so rare, how do they usually behave? In this segment, we learn about how orcas around the world live and hunt.

This quirky ad from New Zealand Air employs characters from J. R. R. Tolkien's Middle-earth trilogy. Enjoy!

A British Gas video featuring Amanda Lamb with tops tips on preparing your home for the winter, including information on bleeding radiators, insulating pipes, and checking boiler pressure.

The Magnus effect is the commonly observed deviation of the spinning ball from a linear flight path. Watch this video to find out why this occurs and what implications it has.

Some orcas do prey on sharks, but how do they do it? Researchers also have to catch sharks occasionally, and there is a particular technique that they use.

Created in 1611, The King James Bible permanently shaped the English language with new phrases that are still in use today. How many of them do you know?

Rachel gives some helpful tips on sounding more like a native speaker when you introduce yourself in English.

Have you ever been unsure as to how elections work in the US on a federal and state level? This video explains it all.

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.

Rachel takes us through different ways of pronouncing the "you" in the phrase "Nice to meet you," and introduces us to a new friend of hers.

The phenomenon of tonic immobility helps researchers study sharks, but does it also help orcas hunt and kill them?

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.