7 year old Theo shows determination while practicing CPR techniques on a dummy during a training organized by Romania's ambulance service in Bucharest, Romania, Tuesday in an attempt to get into the Guinness Book of World Records, on its 105th year in existence, for the largest training session in the world. The attempt was successful, with 7,404 people attending the event, according to local media, more than the previous record held by Mexico. (AP Photo/Vadim Ghirda)

Question: Do you know CPR?