The first practical solar cell is publicly demonstrated by Bell Telephone Laboratories. Date: April 25, 1954 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1954 📅 On This Day (Today)

The Saint Lawrence Seaway, linking the North American Great Lakes and the Atlantic Ocean, officially opens to shipping. Date: April 25, 1959 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1959 📅 On This Day (Today)

The United States Navy submarine USS Triton completes the first submerged circumnavigation of the globe. Date: April 25, 1960 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1960 📅 On This Day (Today)

Robert Noyce is granted a patent for an integrated circuit. Date: April 25, 1961 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1961 📅 On This Day (Today)

Vietnam War: Nguyen Hue Offensive: The North Vietnamese 320th Division forces 5,000 South Vietnamese troops to retreat and traps about 2,500 others northwest of Kontum. Date: April 25, 1972 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1972 📅 On This Day (Today)

Carnation Revolution: A leftist military coup in Portugal overthrows the authoritarian-conservative Estado Novo regime. Date: April 25, 1974 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1974 📅 On This Day (Today)

One hundred forty-six people are killed when Dan-Air Flight 1008 crashes near Los Rodeos Airport in Tenerife, Canary Islands. Date: April 25, 1980 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1980 📅 On This Day (Today)

More than 100 workers are exposed to radiation during repairs of at the Tsuruga Nuclear Power Plant in Japan. Date: April 25, 1981 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1981 📅 On This Day (Today)

Israel completes its withdrawal from the Sinai Peninsula per the Camp David Accords. Date: April 25, 1982 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1982 📅 On This Day (Today)

Pioneer 10 travels beyond Pluto's orbit. Date: April 25, 1983 Read more on Wikipedia → 📅 Other events on April 25 📅 Events on this day in 1983 📅 On This Day (Today)