Indeed! Half seriously, we just need thermoelectric generators to get efficient enough, and then our phones can be powered directly from our body heat, and a

Indeed! Half seriously, we just need thermoelectric generators to get efficient enough, and then our phones can be powered directly from our body heat, and also refrigerate us on a hot day! https://en.wikipedia.org/wiki/Thermoelectric_generator https://en.wikipedia.org/wiki/Thermoelectric_generator