Why men are truly the weaker sex

For millennia it has been the dividing line in the battle of the sexes. Women may be better at multi-tasking, less susceptible to'man flu' and safer behind the wheel -- but, physically, men are the stronger sex. And no wonder: on average, males are 6in taller than females and have twice the upper-body strength, as well as denser bones, stronger tendons and greater muscle mass. Wonder Woman may be taking cinemas by storm this summer, but it's always Superman, with his rippling abs and bulging biceps, who saves the damsel in distress. However, this could be about to change.