What if our biggest idea about reality is built on a hidden misunderstanding? A new philosophical look at space-time challenges the popular view that the past, present, and future all exist together ...

Time is the strange dimension: Unlike its spatial siblings, it is a one-way street as the clock only ever ticks forward and never backward. Scientists have long been aware of time's quirks, with the ...

Anna L. Fisher, Kathryn D. Sullivan and Rhea Seddon taking a break from various training exercises at a three-day water-survival school held near Homestead Air Force Base in Florida. Smithsonian's ...