nel 1940 hanno inventato questo dispositivo per allenare i muscoli delle gambe nei neonati
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00:00...early age. He has an invention with a dual purpose. Not only does it give baby something to do when he's not eating or sleeping, but it also develops the leg muscles, making every child a potential soccer international.
00:21Incidentally, the idea is a great boon to parents, for the infant, having got incredibly bored with the treadmill, takes refuge in sleep.