Countries of the World

There are some rare cases when humans have non-circular pupils, and one of these cases is called coloboma. It can result in several pupil shapes, like oval, keyhole, or teardrop shapes. This is due to a hole in part of the eye's structure, like the iris, retina, or choroid.

Fox hunting is an extremely controversial sport – it originated in England where hunting parties would hunt down foxes with dogs. For animal welfare reasons, the practice is now banned in many countries including England.

Hoover Dam was made with massive amounts of concrete (enough to build 3000 miles of road). In order to cool this concrete, a supersized fridge was invented. This machine dispensed up to a thousand tons of ice every day! The incredible refrigeration machine helped take off decades from the project’s timeline.