Physics
Watch a shape-shifting gel take its first steps
A new spongy gel can change shape like an artificial muscle, as it heats up and cools down, "walking" in water and on land
Regulars
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A new spongy gel can change shape like an artificial muscle, as it heats up and cools down, "walking" in water and on land
A landmark for orbiting travellers, the Eye of the Sahara is a strange, 40-kilometre-wide bullseye in the otherwise featureless desert