Everyone likes a free tasty snack, just check out how people circle like buzzards around those sample tables at Costco. A lot of kids don't even try to hide their greed, and would stuff themselves if the server didn't shoo them off. Now Jell-O wants to add that intimidation factor to a sample vending machine, by using a face scanner that determines your age and won't serve up a free treat if it thinks you're just a pesky kid.