How Does a Microwave Actually Heat Food?
A microwave makes water molecules in your food flip back and forth billions of times a second. The friction of all that flipping is the heat. Nothing is irradiated and nothing cooks from the inside out.
Everyday Life
Answers to the questions you have while standing in your own kitchen. Practical explainers about the objects, labels and habits of an ordinary day.
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What SPF Numbers on Sunscreen Actually Mean
SPF measures protection against burning only, and the numbers are not proportional. SPF 30 blocks about 97 percent of UVB and SPF 50 about 98. The gap that matters is UVA, which SPF does not measure at all.
Why Does Your Phone Battery Get Worse Over Time?
A lithium-ion battery is a chemical system that wears out as it works. Every charge cycle costs a little capacity permanently, and heat costs far more than cycles do.
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