Tick ID

Ticks seem to be more prevelent this year and some of them carry Lyme's disease which is hard to diagnose and can cause many health problems. Do you know how to ID a harmless tick from a potential disease carrying tick? My kids have been asking me alot of questions since we came back from doing a trash pickup along the Minnesota with friends from liberalchurch in April. This article in today's Star Tribune is a big public service helper!