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William Procter and James Gamble settle in the Queen City of the West, Cincinnati, and establish themselves in business — William as a candle maker and James as a soap maker. The two might never have met had they not married sisters, whose father convinced his new sons-in-law to become business partners. As a result, in 1837, a new company was born: Procter & Gamble.

1879 P&G launches its first branded product, Ivory Soap.

P&G becomes one of the first companies to advertise on commercial radio.

In the 1940s, a Belgian chemist mixed carbolic acid and formaldehyde to create the first synthetic adhesive. Post-it Notes use a more recent innovation: Unlike the typical, featureless adhesive surface, the Post-it Note glue coats the notes with bumpy microspheres that limit the sticky area. The adhesive mostly consists of alkyl acrylate, a volatile liquid that dissolves slightly in water and completely in alcohol. More detailed ingredients remain private. The paper used to make Post-it Notes is certified by the Sustainable Forestry Initiative, a system founded by the U.S. paper industry. Although SFI certification ensures that a company has an environmental management system in place, most environmental groups prefer the international non-profit Forest Stewardship Council's more stringent performance-based environmental and social indicators.

died on Saturday night at his home in Kingsport, Tenn. He was 94.

cause was congestive heart failure,

Harry W. Coover, and he has just passed away at the ripe old age of 94.

invented in 1942 as a side effect of another project to create transparent plastic gun sights.

sold as a super glue called Eastman 910.