[K0balt]

A snickers bar has nearly 5× TNT’s energy per kilogram—TNT merely has the habit of being extremely impatient about releasing it.

[moffkalast]

I'm still surprised we haven't figured out a bioreactor you can feed your scrap food and turn it into energy, methane combustion notwithstanding. Like imagine feeding a roomba some sugar and it's set for a few days lol.

[mathgeek]

You could probably even power a time machine without needing plutonium.

[imp0cat]

But only if said Roomba is unable to find enough sugar on the ground for a few days. Otherwise, it's completely self-sufficient, you just have to leave enough crumbs on the floor.