The Romans are credited with the invention of the first smoke-free heating system in Western Europe: the hypocaust. Until recently, historians had assumed that its technology was largely lost after the collapse of the Roman Empire. In fact, however, it lived on in large parts of Europe, and was further developed into the “heat storage hypocaust”, an underground furnace on top of which granite stones would be piled, to then release hot air through vents in the floor. By this means, a room could be kept warm for days with just one firing of the hypocaust's furnace. Continue reading "Heat Storage Hypocausts: Air Heating in the Middle Ages" »
It used to be that when I went out late in the city, I’d play a rousing game of “How long can I keep my phone alive so I can listen to music on the way home?” I would throw my phone into airplane mode, turn the brightness down, and hope it would last until I made it back to my apartment.
Apple has since improved the way it handles battery life, though it doesn’t do everything it could to ensure your phone stays on. There are a few more tricks of the trade you can use to keep your iPhone alive as long as possible. Below, nine foolproof options: