In the late '50s, health advocates proposed reducing saturated fats, such as in butter and beef, from our diets, which propelled the use of margarine instead, a trend that snowballed in the 1980s.
Individuals who have the strength and endurance to independently propel the wheelchair typically use manual wheelchairs.
And if more energy is needed, MFCs can store energy over time and release a lot of it at once; According to the NRL, "Once sufficient power is stored, the [MFC] system can then discharge this collected energy to activate a more power intensive scientific instrument or to propel the rover forward using a novel tumbling or hopping locomotion system".
Planarians move in part by ciliary gliding, producing a layer of mucus in which the ventral ciliated cells can propel the worm without using muscles [15], [24].
With the coming of steam-powered engines to propel ships, the use of sails, rigging, and knots was much reduced, a trend that has continued even on modern sailboats because of the use of special cleats, winches, and other alternative devices to control the rigging.
Twitter is especially suited to sharing quick links, but its 140-character limit has perhaps done more than anything else to propel forward the use of URL shorteners.
The pumps used to propel the water are the same as the one used in the test apparatus.
Propelling the vessel using only this oar, while reclining on the cold floor, requires exceptional skill and patience.
After all, "gravitational slingshots" using Jupiter and Saturn have already been used to propel the Galileo and Cassini deep-space missions.
