A broad category referring to the study of the physical universe including nature and biology.

Mercury is the Hottest Planet


Is Mercury the Hottest Planet?

Mercury is the closest planet to the sun, and thus receives the most direct heat. However, Venus is hotter, as Mercury doesn’t have an atmosphere thick enough to trap and hold heat.

There are Only 5 Senses


Humans have more than 5 senses; we have 5 traditional senses, but over 20 senses in total with non-traditional senses counted. Other organisms have a variety of senses too.

We Know How Many Galaxies There Are


Do We Know How Many Galaxies There Are?

We don’t know exactly how many galaxies there are in the visible universe, but low estimates based on Hubble data start at 100 billion.

Glass Can Be a Liquid


Glass, in any form, is not a liquid or a supercooled liquid, and it does not “flow” in its solid state. Glass is considered an amorphous solid, or just “glass.”

Fluoride is Bad For You


Is Flouride Bad For You?

Fluoride is a name for several fluorine compounds. Fluoride is good for oral hygiene in small doses, but extremely dangerous and toxic in large doses.