MRI

This week I had to get an MRI, which I still don't what it stands for. But anyway, as I was lying down, I looked up at the tunnel thing (which is like two inches from your face after they slide you in, which makes anyone claustrophobic) and it had this weird "x" shaped hole. On the side, there was a label that said a laser sometimes shoots out of there and not look into it. It gave the wavelength of the ray (I think it was 500 nanometers). So I got all excited! I could calculate frequency, Energy of the photons, and all that awesome stuff we've been learning recently. Unfortunately, big numbers like that were too big for my brain so I fell asleep instead. But physics is all around us!