The smallest robot in the world is called origami, weighing only 0.31 grams and 1.6 cm wide.

It was designed by scientists from the Massachusetts Institute of Technology and the University of Munich. The origami can assemble itself, walk over different terrains, and swim, and it dissolves in acetone. It is made of PVC and small magnets. A team of experts has been working on its design since 2012, and the robot was introduced only this year at the international conference of the Institute of Electrical and Electronics Engineers in the US.