What is the difference between a cold and the flu? The flu and the common cold are both respiratory illnesses but they are caused by different viruses. Because these two types of illnesses have similar symptoms, it can be difficult to tell the difference between them based on symptoms alone. In general, the flu is worse than the common cold, and symptoms are more common and intense. Colds are usually milder than the flu.
The history of skiing spans from the Cro-Magnon man to the chairlift. Find out where to get closer to its roots. The history of skiing spans from the Cro-Magnon man to the chairlift. Find out where to get closer to its roots. The ski was invented before the wheel. Twenty-two thousand years ago, when the Cro-Magnon man first attached two sticks to his feet, it was not to race down a snowy mountain just for the thrill of it. Skiing began as a mode of survival, writes Roland Huntford in Two Planks and a Passion: A Dramatic History of Skiing. According to Huntford, cave drawings suggest that man used skis during the last Ice Age in the Palaeolithic period. The oldest ski artefacts, though, come from the more recent Mesolithic period.
Physics Of Skiing â Downhill Skiing. Downhill skiing is also called alpine skiing. It involves high speed and quick turns down a sloped terrain. The skier gains speed by converting gravitational potential energy into kinetic energy of motion. So the more a skier descends down a hill, the faster he goes.