Robert Tymofichuk, a teacher in Alberta, Canada, spent nearly 2,000 hours building an operational hovercraft from salvaged car parts and with no blueprint. By Emmett Lindner On a cold spring day in a ...

Using simple materials such as a paper cup, cardboard, paper clips and balloons to make a rudimentary hovercraft was “strangely difficult,” but much better than sitting in a science classroom taking ...