Eyes are organs that detect light and convert it into electro-chemical impulses in neurons. The simplest photoreceptors in conscious vision connect light to movement. In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain. Eyes with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in molluscs, chordates and arthropods.

The simplest "eyes", such as those in microorganisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms.^{[citation needed]} From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.

Citrus is a common term and genus (Citrus) of flowering plants in the rue family, Rutaceae. Citrus is believed to have originated in the part of Southeast Asia bordered by Northeastern India, Myanmar (Burma) and the Yunnan province of China. Citrus fruit has been cultivated in an ever-widening area since ancient times; the best-known examples are the oranges, lemons, grapefruit, and limes.

The generic name originated in Latin, where it specifically referred to the plant now known as Citron (C. medica). It was derived from the ancient Greek word for cedar, κέδρος (kédros). Some believe this was because Hellenistic Jews used the fruits of C. medica during Sukkot (Feast of the Tabernacles) in place of a cedar cone, while others state it was due to similarities in the smell of citrus leaves and fruit with that of cedar. Collectively, Citrus fruits and plants are also known by the Romance loanword agrumes (literally "sour fruits").

The taxonomy and systematics of the genus are complex and the precise number of natural species is unclear, as many of the named species are hybrids clonally propagated through seeds (by apomixis), and there is genetic evidence that even some wild, true-breeding species are of hybrid origin. Cultivated Citrus may be derived from as few as four ancestral species. Natural and cultivated origin hybrids include commercially important fruit such as the oranges, grapefruit, lemons, some limes, and some tangerines.

George Washington (February 22, 1732 [O.S. February 11, 1731] – December 14, 1799) was the first President of the United States of America, serving from 1789 to 1797, and the dominant military and political leader of the United States from 1775 to 1799. He led the American victory over Great Britain in the American Revolutionary War as commander-in-chief of the Continental Army from 1775 to 1783, and presided over the writing of the Constitution in 1787. Washington became the first president, by unanimous choice, and oversaw the creation of a strong, well-financed national government that maintained neutrality in the wars raging in Europe, suppressed rebellion, and won acceptance among Americans of all types. His leadership style established many forms and rituals of government that have been used since, such as using a cabinet system and delivering an inaugural address. Washington is universally regarded as the "Father of his country."

Matthew Paige "Matt" Damon (born October 8, 1970) is an American actor, screenwriter, and philanthropist whose career was launched following the success of the film Good Will Hunting (1997) from a screenplay he co-wrote with friend Ben Affleck. The pair won an Academy Award for Best Original Screenplay and a Golden Globe Award for Best Screenplay for their work. Damon alone received multiple Best Actor nominations, including an Academy Award for his lead performance in the film.

Damon has since starred in commercially successful films such as Saving Private Ryan (1998), the Ocean's trilogy, and the Bourne series, while also gaining critical acclaim for his performances in dramas such as Syriana (2005), The Good Shepherd (2006), and The Departed (2006). He garnered a Golden Globe nomination for portraying the title character in The Talented Mr. Ripley (1999) and was nominated for an Academy Award for Best Supporting Actor in Invictus (2009). He is one of the top 40 highest grossing actors of all time. In 2007, Damon received a star on the Hollywood Walk of Fame and was named Sexiest Man Alive by People magazine. Damon has been actively involved in charitable work, including the ONE Campaign, H2O Africa Foundation, and Water.org.