Its name was backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging. It also had another meaning because Mercury was the messenger of the goods in Roman mythology. The probe's job was to study Mercury's chemical composition, geology, and magnetic field. She was the first spacecraft which entered the orbit of the planet.
Soviet cosmonaut Alexey Leonov became the first human to leave the spacecraft in a specialized spacesuit. The extravehicular activity took 12 minutes. It did not go well. His spacesuit ballooned. He was angered by heatstroke. His body temperature increased by 1.8 °C. Leonov said he was up to his knees in sweat.
The diesel engine has the highest efficiency of any combustion engine. They produce less carbon dioxide than other types of engines. Their exhaust, however, contains many poisonous air contaminants. Rudolf Diesel died when he was traveling to London on passenger steamer. He went overboard for unknown reasons. His death remains a mystery.