Glycerin. Glycerin is an ingredient that can be found in many beauty products because of its moisture locking properties. It is a form of sugar alcohol that is available naturally in vegetable oils and can also be the byproduct of soap making.
Definition of wheel and axle : a mechanical device consisting of a grooved wheel turned by a cord or chain with a rigidly attached axle (as for winding up a weight) together with the supporting standards
âThe wheel-and-axle concept was the real stroke of brilliance,â says anthropologist David Anthony. That idea required extreme finesse, which only metal tools could adequately provide. However, these didnât become widespread until around 4000 BCE, hence our delay.