Contrail. High-flying jets produce ice-crystal clouds called "contrails" when they fly through moist, frigid air.
More Science Trivia
Albert Einstein. Einstein came to the U.S. temporarily to teach then, when WWII began, stayed in America.
Islets Of Langerhans. German anatomist Paul Langerhans was 22 when he discovered the Islets of Langerhans in 1869.
Reflected Sunlight. Earth's only natural satellite is the Moon.
Smell. There are five steps to mineral identification.