If they ask you which of the inventions of mankind is the most ancient, what will be your first thought? You’ll definitely think about a wheel. But sledge appeared much earlier! And indeed – just tie two front ends of poles to your dog or horse and let the rear ones drag – and you get a primitive sledge. There were so many of them created in different times – sledge without skids (Russian volokushy and Canadian toboggan) and with skids (Siberian and European), sledge with a closed body and even with a sail.