the CDC has interesting ideas on what kids like
http://www.cdc.gov/global/cards.htm
Since anyone can download them, they're not really "trading" cards as such, but nevertheless I have an image of a kid saying "Hey, I'll trade you three 'Ecoli O157:H7 Infection' for a 'Lyme Disease'".
Since anyone can download them, they're not really "trading" cards as such, but nevertheless I have an image of a kid saying "Hey, I'll trade you three 'Ecoli O157:H7 Infection' for a 'Lyme Disease'".