Dolphins are one of the smartest animal species on Earth. In fact, their encephalization quotient (their brain size compared to the average for their body size) is second only to humans. But exactly how smart are they? This video shares some incredible facts about dolphins.

Judging by the 26 billion views on over 2 million YouTube videos of them, one thing is certain: cats are very entertaining. But their strange feline behaviors, both amusing and baffling, leave many of us asking: Why do cats do that? Tony Buffington explains the evolutionary history behind some of your cat’s strangest behaviors.

Do you care about the environment? If so, take a peek at the clip and learn from two children as they teach us what it means to be ‘green’. Taken from Little Pickle Press writer Rana DiOrio’s book What Does is Mean to be ‘Green’?, this clip gives us practical tips for helping preserve our beautiful planet and its scarce natural resources. Enjoy!

Triple-platinum singer/songwriter Taylor Swift threw a party for friends and media Monday night and the theme was the Prom. She was wonderful, as usual, and just a joy to watch her enthusiasm. A video by Jimmy Carter.

Two swimsuit models discuss the ins and outs of trading off their good looks and their probably unrealistic plans for the future after their assets have gone pear-shaped.

When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers? George Monbiot explains the process.

Promotional video for the Strothoff International School Rhein-Main in Dreieich, outlining the school’s international approach and high educational standards.

EPK: Symphonicity Tour Rehearsals and European/ UK Announcement at Abbey Road Studios.

EPK: Part two of Sting's rehearsal together with the Royal Symphonic Orchestra, in preparation for the launch of their European "Symphonicity" tour. Enjoy!

Let's find out more about an American activity aimed at school kids: the spelling bee. What is it and how does it work?

Sigrid talks about "The Elementary Spelling Book" by Noah Webster, which was the basis for the American English dictionary and a big part of the development of spelling bees in the United States.

Sigrid explains how a spelling bee normally proceeds. There are fixed rules and there are options.

In recent years, we've seen an increase in the intensity of tropical storms and hurricanes due to global warming. But how and why do hurricanes form? Sigrid provides a basic explanation of this phenomenon.

We continue to explore the phenomenon of hurricanes. Why are they so dangerous? And do they serve any purpose?

Columbus Day has always been a controversial holiday in the United States. In this video, Sigrid goes back in time to get some historical background, which sheds a new light on its significance.