When not on the move, snails use mucus to stick to plants and other objects.

A baby mannequin wears an invention designed to help sick babies breathe. Called NeoVest, it does away with the traditional mask and breathing tubes that get in the way of a baby feeding and bonding with its parents.  

To reshape living tissue, surgeons usually cut into cells and stitch the wound. This type of surgery creates scars. A new, painless approach would damage few cells and might take only a few minutes.

Individually, each of these disks can only expand and contract in place. But together, when loosely connected by magnets, they can complete a task like moving toward a light.