MRI machines don't spin anything — hydrogen atoms precess, and that wobble is how your body gets imaged. Here's what's really happening inside the scanner.
Vaccines contain small amounts of metals like aluminum and mercury, but context matters. Here's what the science says about whether these trace amounts are actually harmful.
A ruptured brain aneurysm triggers a medical emergency with lasting effects. Learn what happens in the body, how it's treated, and what recovery looks like.