Specific gravity measures the kidney's ability to concentrate or dilute urine in relation to plasma. Because urine is a solution of minerals, salts, and compounds dissolved in water, the specific gravity is greater than 1.000. The more concentrated the urine, the higher the urine specific gravity. An adult's kidneys have a remarkable ability to concentrate or dilute urine. In infants, the range for specific gravity is less because immature kidneys are not able to concentrate urine as effectively as mature kidneys.
For the animated series, see Creepy Crawlers (TV series). Creepy Crawlers (or Thingmaker) is an activity toy made by Mattel, beginning in 1964. The toy consists of a series of die-cast metal molds resembling various bug-like creatures, into which is poured a liquid chemical substance called Plastigoop, which comes in assorted colors. The mold is then heated to about 390 Â°F (199 Â°C) on an open-face electric hot plate oven.
These pests latch onto or burrow into the skin as they breed and lay eggs. As these creepy crawlers derive nutrients at the host's expense, they sometimes leave bruises behind that swell on top of the skin. As the wound begins to heal, the bruise often changes colors; this is part of the healing process and is totally normal.