These paradoxes aren’t philosophical word games — they emerge directly from equations physicists rely on every day.

Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

In a study published in the Proceedings of the National Academy of Sciences, theoretical physicists at MIT explained how ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Doretha Clemons, Ph.D., MBA, PMP, has been a corporate IT executive and professor for 34 ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...