Xenobots are generated from stem cells and get their name from the African frog cells (Xenopus laevis) required to make them. Measuring less than 1mm long and comprised of 500-1000 living cells, Xenobots come in different basic shapes and can scoot themselves in linear or circular directions, join up to act collectively, and move small objects by harnessing their cellular energy for a maximum of 10 days. Video of Large swarm of living robots swimming through water According to a new paper published in the online journal Science Robotics, the researchers' latest project takes it one step further with their Xenobots 2.0 by building life forms that actually self-assemble a body from single cells, don't need muscle cells to move, and have shown the capacity of recordable memory. These next-gen Xenobots are swifter, can maneuver around different environments, have longer lifespans, and still have the ability to cooperate in groups and heal themselves if damaged.