Auto Racing
Baseball
Basketball
Boxing
Cycling
Figure Skating
Football (Soccer)
Football (American)
Canadian Football League
Golf
Men's Golf
Women's Golf
Thoroughbred Horse Racing
Harness Racing
Ice Hockey
Skiing
Tennis
General sporting events
Births
Deaths
... was confirmed 20 years later by using the O18 isotope of oxygen as a tracer label to follow the fate of oxygen atoms during photosynthesis. Light-depend ...