Sleeping bags are designed to retain the heat generated by your body while you sleep to keep you warm. If you're camping in a chilly environment and the bag by itself isn't quite cutting it, you can generate some heat the old-fashioned way -- with a little exercise before you sleep.
Tagged With body heat
Predicting the future is near impossible -- but that doesn‘t stop us all from having a red hot go. Human beings have been predicting the future since the beginning of history and the results range from the hilarious to the downright uncanny.
One thing all future predictions have in common: they‘re rooted in our current understanding of how the world works. It‘s difficult to escape that mindset. We have no idea how technology will evolve, so our ideas are connected to the technology of today.