Part 1 of 5 · freeIntroduction
In 1945, in the United States, the engineer Percy Spencer was working on radar. One day he noticed that the chocolate bar in his pocket had melted. Body heat was not the cause: the radar waves were.
He tried it with corn kernels: the popcorn burst. The idea of an oven that heats differently was born.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2From radar to the kitchen
- 3The first oven was enormous
- 4How it really heats
- 5An everyday object
Open-book quiz9 questions whose answers are in the text.
Glossary4 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
