Small fasteners sewn onto clothing to join two pieces of fabric together.

Injecting a person with a small dose of a virus to help build a defense against a disease.

A board game for two that requires planning and strategy that resembles war planning.

Sitting quietly while clearing one's mind.

A spiritual exercise that includes breath control, meditation, and the adoption of specific body postures. It is widely practiced for health and relaxation.

Fabric made of soft, fluffy fiber that grows in a boll, or protective case, on a plant.

Simple toilets and showers let water fall into drains that lead to sewer systems. People could let water wash through these to carry waste out of the city.

Cities were designed and building codes were in place before the largest Indus Valley cities were built.

 The science of mixing two or more metals to create alloys like iron.

Two religions that originated on the Indian Subcontinent.

The Mahabharata, which was about two families struggling for control of a kingdom, and the Ramayana about prince that encounters the god Vishnu in human form.

A branch of math that uses letters to represent variables.

A social class system based on what family a person is born into. It has changed over time, but even today in India it can influence who people marry and socialize with and the kinds of jobs they do.