The YouTube channel MinuteEarth teaches you small interesting things about our planet. They have 16 episodes so far and each of them is approximately 2:30 minutes. Science facts like »Why are leaves green?« or »Why does earth have deserts?« are getting explained in a very easy and nice made way. The latest episode is called »The Hottest Place on Earth« and you can see it here:
More episodes you can find here on YouTube
Image By: DonkeyHotey – flickr.com (CC-BY-2.0)