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2. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   This leads to a mechanical advantage: the force needed to lift a load is only a fraction of the load's weight. At the same time, the distance the load is lifted is smaller than the length of chain pulled by the same factor. This factor (the mechanical advantage MA) depends on the relative difference of the radii r and R of the connected pulleys:

3. Hoist (device) - Wikipedia

   en.wikipedia.org/wiki/Hoist_(device)

   Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.

4. Rigging (material handling) - Wikipedia

   en.wikipedia.org/wiki/Rigging_(material_handling)

   A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as heavy machinery, structural components, building materials, or large-scale fixtures with a crane, hoist or block and tackle. Rigging comes from rig, to set up or prepare.

5. This device helps you lift really heavy objects with ease - AOL

   www.aol.com/lifestyle/device-helps-lift-really...

   This nifty little tool helps you lift heavy objects like large panels of wood or drywall. It clamps onto the top of the panel and has a handle that lets you carry these large slabs right on your side.

6. Crane (machine) - Wikipedia

   en.wikipedia.org/wiki/Crane_(machine)

   The generally accepted definition of a crane is a machine for lifting and moving heavy objects by means of ropes or cables suspended from a movable arm. As such, a lifting machine that does not use cables, or else provides only vertical and not horizontal movement, cannot strictly be called a 'crane'. Types of crane-like lifting machine include:

7. I’m an orthopedist. 7 things I never do to keep my muscle and ...

   www.aol.com/m-orthopedist-7-things-never...

   Using too much weight, lifting with your back instead of the legs, and even the wrong hand grip can result in pain and injuries. These include muscle strains, torn rotator cuffs, patellar ...