Lake Geneva to swim at some beaches of the lake; indeed, visibility under water was near zero. By the 1980s, intense environmental pollution (eutrophication) had almost wiped out all the fish. Today, pollution levels have been dramatically cut back, and it is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wakeboarding), rowing, scuba diving and bathing. On a scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss Physicist Daniel
French name of the name, being associated with claims to a place, but this is not always the case. The name de Gaulle, for example, is not a traditional French name with a "particule", but a Flemish Dutch name that evolved from a form of "De Walle" meaning "the wall". A popular misconception is that the "particule" "De-" included in the name always indicates membership of the nobility, that is to say, an original separated "de" that was linked to the name during the French revolution as "De-". That is sometimes true. Almost all nobility titles are of the form [title] <nowiki>[</nowiki>particle