Why when we're 18 are we able to go out partying every night and drink alcohol without getting a hangover (or just a very mild one), but by our early twenties we already don't have the energy to go...
chaemotherapy and radiotherapy, both treatments to cure cancer, but whats the difference? and in what situations (and why) is one used over the other? what are the side effects? how do you do it/them?...