May 1, 2014 will be the 20th anniversary of the death of Ayrton Senna, the last driver to die in a Formula One grand prix. In the early years of the sport—the 1950s, 1960s and 1970s—such a gap between fatalities would have been unimaginable. F1 was just too dangerous.
(Photo credit: Diamond Docs et al. via IMDB)