Liquid Mercury

Mercury looks pretty, in its shiny, fast-moving liquid form, but don't touch! it can be extremely poisonous to humans.
The symbol hg that mercury is known by comes from its greek name, hydrargyrum, which means "liquid silver" — to reflect its shiny surface. The element is also known as quicksilver for its mobility. Named after the fastest-moving planet in the solar system, mercury has been known to humanity for ages. In fact, evidence of its use has been found in china, india and egypt, and traces of mercury were found in 3,500-year-old egyptian tombs.
Mercury is a very toxic element. It can enter the body through an open wound or by inhaling or ingesting it. It can then cause damage to nerves, the liver and the kidney, as well as a number of other symptoms.