Perhaps you've visited a restaurant and seen clear, water-filled bags hanging on the doors or cinched up in the outdoor dining area. You might ask, "What's all this about? Some crazy new way to control temperature? A scheme to save money on water pitchers?"

Just a pinch of it and it’s worth it. We’re talking salt here. Used throughout human history, mentioned often in the Bible, ubiquitous and cheap. Mined from salt rocks and extracted from sea water, salt is… well, the “salt of the earth.” You can’t live without it healthily. At the same time, you can’t live healthily with too much of it. Get the balance right – in your food and in your live – and salt is worth it’s own weight.

One Russian farmer decided to equip his cow barn with… LED TVs.