Almost half of all Alzheimer's cases could be prevented by tackling 14 lifestyle factors from childhood, a landmark study suggests. World-leading experts found two new risk factors — high ...

2 is the only even prime. 2 + 14 = 16. 14 has more than two factors (1, 2, 7, 14). Other pairs of even numbers adding to 16 can be ignored (4 + 12, 6 + 10 and 8 + 8), none are prime. 16 = 1 + 15.