What Indian inventions are we still using today?

Note that the Indian science of the times of the ancient world was sufficiently developed for its era, therefore we still use some of their inventions. For example, the Hindus have developed the decimal counting system familiar to us in everyday life. Also in medicine, craniotomy, operations to correct the shape of the nose and ears are used. Indian astronomers gave the concept of the movement of the earth around its axis. Mathematicians developed a system for solving linear equations, showed how to extract square and cubic roots from numbers.