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World's smallest origami BIRD is 20 times smaller than a grain of sand (www.dailymail.co.uk)

Made from sheets only some 30 atoms thick, the robots are made of so-called ‘shape memory actuators’ which fold and stay folded when an electric jolt is applied.

The ex-Pfizer scientist who became an anti-vax hero. (www.reuters.com)

Five reasons why COVID herd immunity is probably impossible (www.nature.com)