power
the nuclear power generating units on voyager weigh a combined 113 kg. they were manufactured in the 70s. today we could build one for less weight that uses 1/10th the amount of nuclear material. new, they generated some 470 watts. now they're down to about 300 watts. i once estimated the continuous power draw of an electric car at 500 watts. so in theory, you could put one of these nuclear power supplies in your electric car. it'd recharge the batteries all day all night. and you'd be able to drive your 66 kilometers per day average american usage. like for as long as you own your car. and you'd never even have to plug it in. ever. but you could. if you wanted to drive past the range of the batteries. which would be kinda nice.