Why Is Nuclear Fusion Always 30 Years Away?
The joke is old and the reason is specific: fusion needs conditions that only exist inside stars, and building them on Earth costs more energy than the reaction has so far returned.
physics
Start here
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.
Why Is the Sky Blue?
Sunlight contains every colour. Air scatters the short blue wavelengths far more strongly than the long red ones, so blue arrives at your eyes from every direction at once.
More topics