The technician squirts a large amount of cold, greenish gel over your chest, then picks up a device that looks like a barcode scanner and starts slathering the gel around with it. On the screen next to you, shifting grey shapes resolve into a ghostly image of your heart beating. The whole thing takes 30 minutes, after which the technician hands you a paper towel to wipe up the gel. You’ve just had an ultrasound. Now imagine taking that experience […]