Social Worker Certificate Program Information. Social worker certificate programs, which may be offered at the bachelor's or graduate level, cover human behavior, social environments and laws, communication techniques, social welfare policy and more.
Explanation of Color From a Prism. Although no one knows who invented the prism, Sir Isaac Newton was the one who discovered that the rainbows they produced were merely the components of white light that had been separated. Usually just called light or âvisible light,â white light comes from the sun.
In 1962, when he was 33, the scientist Nick Holonyak, Jr., created the first practical visible light-emitting diode. Holonyak wasn't trying to create a light that would replace incandescent bulbs. He was trying to make a laser. One device that did not exist was a semiconductor laser. Other GE scientists were working on creating an infrared semiconductor laser; so Holonyak decided he would make a visible one.