Leptin is a cell-signalling hormone vital in the regulation of appetite, food intake and body weight. Studies have shown that an absence of leptin in the body or leptin resistance can lead to uncontrolled feeding and weight gain. Mechanisms and actions of leptin Leptin acts as a hormone that modulates the size of the adipose tissues in the body.
The Rosetta Stone The Rosetta Stone What is the Rosetta Stone? The Rosetta Stone is a stone with writing on it in two languages (Egyptian and Greek), using three scripts (hieroglyphic, demotic and Greek).
This Day in History: 07/19/1799 - Rosetta Stone Found. In a This Day in History video, learn that on July 19, 1799, the Rosetta Stone unlocked the language of the pharaohs. For 14,000 years, no one had been able to read Egyptian hieroglyphs until Napoleon's army stumbled upon a clue: a 4x2 tablet with three languages inscribed on it.