Who was the first driver to race in 100 grands prix? George Edwards
There's actually a tie for this one: Jack Brabham and Graham Hill both took part in their 100th Grand Prix in Canada in September 1968.
They held the record jointly until Brabham missed the French GP the following year, allowing Hill to take the lead with 107 races. Brabham briefly reclaimed first place in 1970, but retired after that season; Hill pushed on to become the first man to contest 150 GPs, in 1973, and finished with 175.
Jacques Laffite beat that mark in 1986, in what turned out to be his 176th and last race; in March 1989, Riccardo Patrese went past him, and in 1990 became the first driver to take part in 200 GPs.
Patrese's 256th and last race was in Australia in 1993; it was nearly 15 years before Rubens Barrichello eclipsed that in 2008. Barrichello went on to take part in 323 GPs. Michael Schumacher (307) is the only other man to have competed in more than 300; Jenson Button currently stands third, on 275.
The first to 50 was Juan Manuel Fangio, in his native Argentina in 1958.