Gallium is a chemical element with symbol Ga and atomic number 31. It is in group 13 of the periodic table. It will melt to a liquid at temperatures greater then 85 degree, slightly above room temperature. Which means it will melt in your hands.
Health effects of gallium
Pure gallium is not a harmful substance for humans to touch. It has been handled many times only for the simple pleasure of watching it melt by the heat emitted from a human hand. However, it is known to leave a stain on hands.