Thesis: Athletes who began playing tackle football before the age of 12 had more behavioral and cognitive problems later in life than those who started playing after they turned 12
Evidence:
1.A study shown by the University of Boston shows that 110 out of 111 brains of deceased former NFL players had a degrative brain disease.
2. Doctors at Wake Forest School of Medicine used Magnetic Resonance imaging technology to analyzed boys between the ages of 8 and 13 who played only one