Laughing gas is known for making people feel happy, relaxed, or giddy. It can make you feel giggly and less aware of pain.

Chalk is a fine-textured form of limestone. It is composed of several tiny fragments of the calcite shells or skeletons of ...

A lead-acid battery is a type of rechargeable battery, invented in 1859. It uses lead plates (electrodes) submerged in ...