How to go up to the hill without slipping and how to go down the hill as fast as possible. The solution of this two oppositely standing factors is the long-lived problem of cross-country skiers. The wax was the solution for […]
Continue readingHow to go up to the hill without slipping and how to go down the hill as fast as possible. The solution of this two oppositely standing factors is the long-lived problem of cross-country skiers. The wax was the solution for […]
Continue reading