Which pulley system is best? Gym memberships can be expensive, but that’s a poor excuse for not doing your best to stay in shape. If you can’t afford the luxury of having a monthly membership to a ...

The HitchMaster is a simple pulley with no moving parts. Like any pulley, it works by trading force for distance: it's easier to lift, say, an engine block, but you'll have to pull the rope a lot ...

Can you make an elevator out of a spool of thread, some string and a hanger? Your friends might think it is magic, but it’s science at work! Here’s an easy experiement that has its ups and downs! 1.