Sciatica causes pain that begins in the lower back and spreads through the buttock, leg, calf and, occasionally, the foot. The pain generally will feel dull, aching or burning. Sometimes, it starts gradually, worsens during the night, and is aggravated by motion. Sciatica also can cause tingling, numbness or muscle weakness in the affected leg.
A callus (or callosity) is a toughened area of skin which has become relatively thick and hard in response to repeated friction, pressure, or other irritation.Rubbing that is too frequent or forceful will cause blisters rather than allow calluses to form.oo much friction occurring too fast for the skin to develop a protective callus will cause a blister or abrasion instead. Biologically, calluses are formed by the accumulation of terminally undifferentiated keratinocytes in the outermost layer of skin.
By: David T. Have you ever wondered what made crocs feel the way they do? They re so comfortable, soft and pliable yet they re so sturdy. Crocs are made out of a foam resin called croslite, which is made out of a polymer called ethylene-vinyl acetate (EVA).Ethylene-vinyl acetate is a copolymer of ethylene and vinyl acetate.Vinyl acetate makes up anywhere from 10 to 40 percent of the copolymer, and the remainder is made up of the ethylene.y: David T. Have you ever wondered what made crocs feel the way they do? They re so comfortable, soft and pliable yet they re so sturdy. Crocs are made out of a foam resin called croslite, which is made out of a polymer called ethylene-vinyl acetate (EVA).