Have you ever seen a microwave before? It's a little box that cooks your food by using waves of energy that make the food hot. Scientists and doctors have been studying these waves and how they might affect our bodies if we are exposed to them for a long time.
Some people are worried that using microwaves a lot, like if you stand near one all day, might not be good for your health. This is called "microwave news". Scientists are doing lots of studies and tests to see if there is really a problem or not.
Until they know for sure, it's probably a good idea to be careful and not spend too much time close to a microwave. But you don't have to be afraid or worry too much, because most people don't use microwaves in a way that would be dangerous. Just use them like you normally would for heating up food and you'll be okay.