A strange form of matter called a time crystal has fascinated physicists for about a decade. These systems move in repeating ...

I pushed eight free AI chatbots to their limits to find the best AI chatbots of 2026. To explore our top picks, check out ZDNET's chatbot-by-chatbot guide.

Bonds can provide income and help hedge against risk in a portfolio. Learn about the different types and which ones may be right for you.

While bone is twice as tough (resists fracture), ivory has double the strength (withstands breaking completely). Ivory is ...