Physics
Microwaves
Quick fact
The first microwave oven, the Radarange, was invented in 1945 after engineers noticed that a chocolate bar melted in the pocket of a radar technician working with magnetrons.
Why this is interesting
You've probably used a microwave oven to heat leftovers, but did you know that the same kind of waves are used to beam your Wi‑Fi signal across the room and even to communicate with satellites? What makes these invisible waves so versatile?