on their lap. that's not a good idea and you feel the heat. >> this may go into the file of, let's use some common sense. there's something known as toasted skin syndrome and dermatologists are talking and this. there was a study showing boys as young as 12 years old putting the laptop on his lap and creating sort of a burn of the skin. the skin became quite modeled. it will go away after a while, but look, if it's -- they generate a lot of people. you're putting it on your lap, and a laptop can cause a problem to your legs. they say don't use a pillow because that reduces the venting anymore, so use a tray or something to allow the laptop to cool itself. >> we just went around the world. >> we did. we got a lot more to do, too. >> i know. dr. sanjay gupta, thanks so much. appreciate that.