Skin color - patchy. Patchy skin color is areas where the skin color is irregular. Mottling or mottled skin refers to blood vessel changes in the skin that cause a patchy appearance. Irregular or patchy discoloration of the skin can be caused by: Changes in melanin, a substance produced in the skin cells that gives skin its color.
The modern world is an electrified world. The light bulb, in particular, profoundly changed human existence by illuminating the night and making it hospitable to a wide range of human activity. The electric light, one of the everyday conveniences that most affects our lives, was invented in 1879 by Thomas Alva Edison.
1878 Thomas Edison founded the Edison Electric Light Company 1878 Hiram Maxim founded the United States Electric Lighting Company 1878 205,144 William Sawyer and Albon Man 6/18 for Improvements in Electric Lamps 1878 Swan receives a UK patent for an improved.