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-on-the-Lake, Ohio the Jennie Munger Gregory Museum. Vacation residences continued to grow and expand through the early 1900s to include places such as the Idle-A-While and Shady Beach Inn. Erieview Park was started in 1945 by E.M. "Pop" Pera, and it grew to include nine adult and nine children's amusement park rides including The Fright Zone, one of three scary dark rides created by the Allen Herschel Co. The park closed in 2006, but the Ferris wheel and carousel are still in operation nearby. Starting in 1964 with the purchase of Chestnut Grove, portions of land which were to become the Geneva-on-the-Lake