Big History Quiz

Hummingbirds are small. Bee Hummingbirds are so small that they’re sometimes mistaken for insects (hence the name)! They’re the smallest bird in the world and are two and a quarter inches long and weigh less than a dime.

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.

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.