Add self-charging to this cute little Nao robot's feature list. In the following video, Nao sidesteps delicately to his charger, then walks out a bit to relax while charging.
When done, the versatile Nao robot flicks the charger cable out with a simple hand gesture, thoughtfully shown in slow motion in the following brief video.
The first mention of self-charging robots, as far as I know, is in the delightfully manic 1960 short story Callahan and the Wheelies by Stephen Barr:
... It turned its photoelectric scanners this way and that, waving its jointed grappling arms about. Then it appeared to make up its mind, and trundled over to a wall socket in the baseboard, plugged itself in and proceeded to recharge itself.
(Read more about the self-charging robot)
Mechanical Horse Sculpture Gallops In Place
'Rod placed the brain inside the panel... the horse raised its head, wiggled its ears, blinked twice, gave a tentative whinny.' - Christopher Stasheff, 1969.
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Orion's 'Skip-to-M'Lou' Entry
'A lightning pilot possibly could land that tin toy without power and still walk away from it provided he had the skill to play Skip-to-M’Lou in and out of the atmosphere...'