Soft Robotics

Soft robotics is the branch of robotics that builds machines out of bendable, squishy materials — rubber, silicone, fabric, gels — instead of the rigid metal and hard plastic we usually picture when we hear the word "robot." Think less of a steel arm and more of an octopus tentacle, an elephant's trunk, or an inflatable pool toy that can curl and squeeze. Many of these robots have no stiff skeleton at all; they move by being pumped full of air or fluid, by pulling on built-in cables, or by materials that change shape when heated or charged, so the whole body deforms in smooth, continuous curves rather than hinging at separate joints.

The reason to go soft is that softness is forgiving. A rigid robot arm that bumps a person can bruise or break a bone, so it must be fenced off and watched; a soft one can press right against you and simply give way, which makes it far safer to work hand-in-hand with people and gentle enough to handle a ripe tomato, a fragile lab sample, or living tissue inside the body. Softness is also wonderfully adaptable: a soft gripper does not need to know an object's exact shape to hold it — it just wraps around and conforms, the way your hand molds itself to whatever you pick up, whether that is a wine glass or a crumpled sock. The trade-off is that soft robots are harder to control precisely and usually weaker than their rigid cousins, because the same bendiness that makes them safe also makes them wobbly, slow, and difficult to steer with pinpoint accuracy.