3 ms·That's nice, but it won't replace the trusty abacus. That's what you need for a real apocalypse.by nntwozz 1y agoThat's nice, but it won't replace the trusty abacus. That's what you need for a real apocalypse.timbit42 1y agoMy solar powered calculator will be fine.nntwozz 1y agoWhat if there is a flood and the electronics get corroded? The abacus can take it, and if it breaks it can be rebuilt with simple tools.