Liquid Armor

Armour is handy, but it's heavy and inflexible - so scientists have developed liquid armour, which is designed to offer the best of both worlds. There are two kinds of liquid armour: Shear Thickening Fluid (STF), which hardens on impact, and Magnetorheological (MR) fluid, which is essentially iron particles suspended in liquid. Add a magnetic field and MR fluid becomes solid in fractions of a second. Of the two, STF liquid armour is the current favourite: MR fluid armour is still a good few years away.