Radar
Radar is a detection system that emits radio waves and analyzes their reflections to determine an object’s distance, direction, and other properties. It is used in aviation, weather observation, navigation, and defense.
The myth that carrots sharpen night vision came from World War II British propaganda. In 1940 British pilots downed German bombers at night using radar; to hide it, officials told the press the pilots ate lots of carrots. Carrots can't boost normal vision.
0
The Yagi-Uda antenna, invented in Japan in 1926, was vital for radar, but Japan ignored it. Britain used it to gain a decisive edge in World War II. At Singapore, Japanese soldiers found "Yagi" in a British technician's notes—and asked him what it meant.
0
In 1945, engineer Percy Spencer noticed his chocolate bar had melted near a radar device. He tried popcorn—it popped. An egg exploded. Realizing microwaves heated water molecules, he patented the idea, and the world's first Microwave oven was born.
0