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
Geneva Seal precious metal object. In this context the German translation of hallmark, which is "stempel" or "stamp" may be helpful to foster an understanding of and distinguish the terms. The motif of the Geneva Seal is the seal of the Canton of Geneva. This becomes evident when one translates its name from the German. As the reader may recall the official languages of Switzerland are German, French, Italian and Romantch (used in that order). But this issue about the translation is still a matter of debate because the term used by Timelab is the "Hallmark of Geneva". (Timelab is an organization