In the last thirty years, cars have become heavier and larger. This alarming trend has been addressed by European authorities, who have imposed new measures to curb pollution. But are these measures actually working?

In an effort to promote ecotourism, the town of Echelles has constructed one of the largest natural bathing areas in France. Its filtration system is 100% natural, powered by thousands of plant seedlings.

In part four of this episode on "The Discoverers," Galileo, now a reputable scholar at the University of Padua, proceeds to make a telescope out of lenses with the help of his instrument maker, Marc'Antonio. In this cartoon, an attempt is made to explain Galileo's discoveries.

Finding food was often difficult for the earliest settlers of the Americas. Luckily for the characters in this video, there's enough berries to go around.