In 1912, German geophysicist Alfred Wegener proposed that all land on Earth was once part of a hypothetical protocontinent, which he called Pangaea. Wegener hypothesized that the supercontinent, completely surrounded by a world ocean called Panthalassa, began to drift apart approximately 200 million years ago. Evidence supporting Pangaea's existence includes the presence of identical species on continents that are now far apart, as well as the continuity of what on different continents?
Back in the day
Once a renowned heavyweight boxer, Tyson sought a comeback in 1995 after spending three years in prison following a rape conviction. His first fight with Holyfield in 1996 saw Holyfield, who was in the midst of a comeback of his own, defeat Tyson for the heavyweight title. Their 1997 rematch was temporarily halted when Tyson bit off a piece of Holyfield's ear—and permanently stopped when Tyson bit him again on the other ear and was disqualified. What reason did Tyson give for the infamous bite?
Born on a day like today
In 1894, French president Sadi Carnot died because surgeons could not reconnect his severed veins after a stabbing. The incident inspired Carrel, a French surgeon, to develop a suturing technique based on methods used by embroiderers. Known as triangulation, the technique is still used today. Carrel won the Nobel Prize in Physiology or Medicine in 1912 for his work on sutures and organ transplants. He also developed the artificial heart with what American famous for non-medical work?