pi day

Tributes flood in as world remembers Stephen Hawking

Figures from the scientific community and beyond came together to mark the passing of famed physicist Stephen Hawking, who died at age 76 on Wednesday, the same day as Albert Einstein's birthday, also known as "Pi day."

Pi Day (and other odd dates)

With Thursday marking Pi Day, find out more about what makes the day special and learn about some other intriguing dates that have been the source of fascination and speculation.