- Silicon dioxide (Wikipedia)
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz. In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a synthetic product. Examples include fused quartz, fumed silica, opal, and aerogels. It is used in structural materials, microelectronics, and as components in the food and pharmaceutical industries. All forms are white or colorless, although impure samples can be colored.
- Charles Wilkes (Wikipedia)
Charles Wilkes (April 3, 1798 – February 8, 1877) was an American naval officer, ship’s captain, and explorer. He led the first United States Exploring Expedition (1838–1842). During the American Civil War (1861-1865), he commanded USS San Jacinto during the Trent Affair incident in which he stopped a British Royal Mail ship and forcibly removed two Confederate diplomats, almost leading to war between the United States and United Kingdom.