She vividly remembers the adrenaline of watching her brother racing cars. Now at age 83, her wish to speed around a track ...

By wiggling a needle around while spinning it, you can minimize the amount of space it moves through, compared to the larger circle traced by turning it around its center. Claudio Rocchini via ...

With the wheel now free spinning, the team is elated to see the mechanical advantage is such that spinning the shaft by hand is enough to cause a very slight rotation of the pulley and cables ...