The ones advertised on Meta platforms (and others like YouTube), at least the ones I've seen, claim to do so in a device that looks like it can't have more than a tiny battery and no cooling in there, or that they actualy show using standard AA batteries, or recharging inside an hour by solar energy, or other claim that thumbs its nose to the lawsof physics. But they must be real, after all that nice man left NASA to work on it and now the nasty commercial interests are trying to shut him down! I must buy one now while I still can!