I would like to know if the rule about dropping food on the ground, then picking it up to eat before 5 seconds is as safe as it sounds. What is the rate of germs per second on different types of surfaces? (ex: carpet, parking lot, grass, dirt, wood) Will it actually gather more germs if it sits for more then 5 seconds? Can you blow the germs away?

Tested on the show and busted. If you want more details use find, this has been discussed before.