Mohs hardness scale
Science

Name the Mohs hardness scale

The Mohs hardness scale is composed of 10 minerals that have been given arbitrary hardness values. Can you name the minerals that make up the scale? […]

Birthstones Quiz
History

Do You Know the Modern Birthstones?

Birthstones are gemstones that represents a person’s month of birth. The official list of modern birthstones from the American National Association of Jewelers were officially adopted in 1912. […]