Robot smaller than a flea? This is what the Northwestern University Engineering have developed (dubbed as the world's smallest remote-controlled robot) in the shape of a crab. About half a millimeter wide this tiny crab has the ability to do every basic little movement by heat actuation Read the whole paper here: https://www.science.org/doi/10.1126/scirobotics.abn0602 To check out more innovations: www.bellaward.com