The microwave oven was invented
after a technician noticed something unusual.
What?

Question

Accepted Answer

The chocolate bar in his pocket melted while he was standing near an active radar. — Percy Spencer, 1945. He tested with popcorn next. Raytheon patented it as the 'Radarange'. Modern kitchens owe a debt to radar research.

The microwave oven was invented after a technician noticed something unusual. What?