This of course flies in the face of the public's perception of parents as protective nurturers, but the fact is that mothers and fathers are a far larger threat to kids than any stranger.

The new armour is not pure liquid, of course. Rather, the fluid is sandwiched between layers of Kevlar, a high-strength polymer commonly employed in protective gear.

Of course, be sure they have on protective gear, including a helmet, knee pads and elbow pads.