Quicksilver.

Mercury (Hg) has an atomic number of 80. Also known as quicksilver it is quite heavy and is the only metal that is liquid at room temperature. It is so dense that you can pour it into a beaker and drop in a coin and watch as the coin sits on top of the liquid. It has a freezing point of ?38.83 °C and a boiling point of 356.73 °C.

I have always had a fascination for quicksilver. Pictured is a mercury switch used in electrical applications in years gone by. I could sit there for hours spilling the quicksilver back and forth inside the glass, feeling the heavy weight of it. It's like a liquid mirror.

Yeah, i'm weird, I know.