Challenge yourself with the "Hard Sciences" and the natural laws that govern the physical universe.
Test your knowledge with these top questions!
Which winter constellation contains the bright stars Betelgeuse and Rigel?
Orion dominates winter skies with Betelgeuse and Rigel marking the hunter shoulder and foot.
What shape does a lone soap bubble usually form as it floats in still air?
A sphere encloses a given volume with the least surface area, so surface tension pulls a free bubble toward that shape.
Which inventor made elevators safer with a brake that caught the car if its lifting rope broke?
Otis demonstrated the brake by having the rope cut while he stood on a raised platform.
A beaver slaps its flat tail on the water mainly to do what?
The loud splash can send other beavers diving underwater, where land predators have a harder time reaching them.
Which dandelion structure can regrow the plant if part remains after weeding?
A dandelion's taproot stores food, so cutting off the leaves may leave enough reserves for new growth.
Catalan's constant helps physicists calculate the number of ways to arrange what items on a grid?
In statistical mechanics, this arises in the dimer model, which calculates how two-square tiles can completely cover a large rectangular grid.
Which Mars rover carried a tiny helicopter named Ingenuity to the red planet?
Perseverance carried Ingenuity to Mars, and the small helicopter made its first powered flight there in April 2021.
Towering cumulonimbus clouds hold the unique distinction of producing what weather phenomenon?
These towering clouds are the only cloud type capable of generating lightning, caused by colliding ice crystals that build up massive static electrical charges.
Which pelvic structures carry body weight while a person sits upright?
Each sits on the lower rear part of a hip bone, below the broad ilium that forms the rim at the waist.
Which color best describes common rust on iron objects?
The reddish tint comes from iron oxides, the same compounds that give Mars its red color.