system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we have to cook food in the oven for 20 minutes, but we can cook it in the microwave for 3 minutes?
gpt
Different types of energy.  Convection is limited by diffusion.  Microwaves have far greater depth of penetration and spin all of the water molecules in food.  The resulting kinetic energy of the spinning molecules gives off heat.