Shampoo has its origins on the ancient Indian subcontinent. The word shampoo comes from the Hindi word champo, meaning to press or massage.

Hans Schwarzkopf invented liquid shampoo in Germany, and his last name became a major brand name across Europe.

Modern dry shampoo was invented in the 1940s.

Before the rise of plastic bottles, shampoo was often sold in glass containers.

There is an environmental movement that rejects commercial shampoos in favor of natural alternatives, commonly referred to as the “no poo” movement.

The secret to most hair-friendly shampoos is simply an adjustment of pH levels.

There are now shampoos infused with CBD to help calm scalp inflammation.

NASA astronauts use a waterless shampoo formulated by the space agency.

Before modern safety regulations, some shampoos actually contained radium and other radioactive materials.

Certain luxury shampoos cost over $300 per bottle and come in elegant glass packaging.