We give you an obscure word with four definitions—one correct, three made up. Can you identify the correct one?

In the 1950s, the science kits sold in toy stores may have contained real radioactive material.

A science fiction writer called it an “artifact of such utter simplicity and perfection that it seems it must be either the ...

Recently, Mental Floss broke down the state names that Americans find the hardest to pronounce, based on a study by language learning website Preply. As part of ...