Is it Safe to Stand Near a Microwave?

How does aspirin help with a headache? Does microwaving your food affect its nutritional content? What happens to eye drop bottles during a flight? How can we stop waste medicines leaking into the environment? Is it safe to stand near a microwave when it is in operation? Can we tell when someone is looking at us? Plus news that cancer cells carry bacterial passengers that could be a new target for treatment. Chris Smith answers your science questions on South Africa's Talk Radio 702...