Human body is a fascinating mechanism where every detail matters. In the course of evolution human body becomes more advanced and gets rid of items it no longer needs: like a tail. Several hundred million years ago our ancestors used tails for swimming just like fish. Wouldn't it be cool to have a tail? Let's find out why exactly we lost them.

There’s so much going on in airports and on board the planes that you don’t need to bother learning it all. But there are things you do want to know — yet no one will tell you about them. Do you know, for example, why if you get off the bus and step away too much, the ground crew might ask you not to walk under the airplane wings? Or what a ‘decision altitude’ is? Or what is a reason you won’t ever see an elderly person or a child in the emergency exit row? Wanna know those and other secrets? Here they are!

You probably aren’t the only one looking to pull the ol’ switcharoo. Even if just a few passengers do it, they could throw the plane off balance! And since most aircraft are incredibly sensitive to changes in their center of gravity, it can lead to dramatic consequences. During takeoff, pilots must know the distribution of weight on the plane to make exact calculations. If these calculations are off even the slightest, there are chances that the aircraft can crash while leaving the ground. So before nestling in a more comfortable or spacious spot, ask a cabin crew member if you're allowed to do so.

If you've ever seen a wasp nest, you might have confused it with a paper balloon or a rugby ball. Wasps make their nests from chewed wood pulp and saliva. They are usually dull grey or brown in color but inside there's a whole amazing world! Let's imagine we could walk inside - what would we see?