It’s kind of safe too, or at the very least, it’s safer than playing with Mercury. Gallium is a metal whose melting point is at 29.76 °C (85.56 °F), below your skin temperature. That means that simply handling a little block in your hands will melt it and you’ll have liquid metal in the palm of your hand! We wouldn’t recommend ingesting it since it is metal, and it will temporarily stain your skin as it gets into the crevices on your epidermis, but it’s still safe enough to play around with and show your friends and even kids. You can get a 20g chunk of it on Amazon for $10, which is dirt cheap for anyone with a slight scientific inclination, or that just likes anything remotely cool.