18 Bizarre Discoveries That Can Baffle Even Scientists

Honestly, it looks like water that got frozen on top of a leaf and then someone just took it..

There was a link right under the picture to tell you how to do it yourself. I believe it's just soap and bicarb, probably. Just click on the link and find out yourself.

At first I thought it was a rotten tennis ball..

It's a tree that produces it. A tree with an attitude, because it has unpleasant little thorns! But the Native Americans used them to make bows with that would outlast any other wooden bow, and settlers loved to use the wood as fence posts, because they'd last a LONG time compared to other wood. And it has an interesting yellow color to the wood, too, but it's so hard to work with, you seldom see furniture built with it.

Sadly, it probably is. There's all the time mines hurting or killing people in old war battle areas, all over the world. They don't get safe, they just get more unstable. I imagine it's the same with the underwater mines.