Lunchbox Envy 30: Microwaves
Sep 7, 2025
Discover how squirrels played a surprising role in the invention of the microwave. Uncover the quirky story of Percy Spencer's popcorn experiments and the transition to countertop models. Explore the mechanics behind how microwaves heat food, including standing waves and the infamous turntable fix. Learn why ants can survive microwaves and the mystery of energy-hungry microwave clocks. From cooking mug cakes to bizarre experiments with frozen hamsters, this discussion reveals the fun and unexpected uses of this kitchen staple.
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Why Microwave Windows Block Radiation
- Microwaves used in ovens operate at ~2.45 GHz, corresponding to ~12.2 cm wavelength.
- The oven window has tiny holes sized to block microwaves while letting visible light through so you can safely see inside.
The Peanut Bar That Sparked The Microwave
- Percy Spencer discovered microwave cooking when a peanut bar in his pocket melted while he worked with magnetrons at Raytheon.
- He later made popcorn, tried cooking eggs (which exploded), and patented early microwave technology in 1945.
Turntable Solved Uneven Heating
- Microwaves create standing waves inside the cavity, producing hot and cold spots that heat food unevenly.
- The turntable was invented to rotate food through those standing-wave patterns and greatly improve even cooking.