Galinstan

Galinstan is a non-toxic, liquid metal alloy which melts at 11 °C (52 °F). It's made by combining gallium, indium, and tin. It's fun to play with and also do science experiments with. It's liquid metal you can hold in your hand. It's good to wear gloves while handling Galinstan. Galinstan stains hands and stuff, but you can wash it out with soap and water.