heat treatment

Evidence that early modern people living in the southern tip of Africa's coast 72,000 years ago used fire control techniques to increase the efficiency and quality of the process

If you meet a person with sunstroke, take them to a cool or air-conditioned place, cover with a damp cloth or splash cool water on them.

If you think that the stone on the ring is big and gorgeous, the diamonds processed in the laboratory by the new method will overwhelm you.