Athlete Success Linked to Their Birthdays

Boys born in January or February are more likely to be NHL stars than boys born in December. Len Berman says it's a proven fact. Ten L.A. Kings players, for example, were born the first two months of the year. But he wonders how do you explain the disproportionate number tennis stars, like Rafael Nadal, Bjorn Borg and Anna Kournikova who are all born in June?