Okay kiddo, have you ever seen a baby cry? Tin can also cry but it's not because it's sad. When we heat up tin, it doesn't melt like ice, it changes its shape and makes a strange sound, it's called "tin cry". It's like when you step on a toy and it makes a funny noise, but much louder. Scientists think it happens because the tin atoms are rearranging themselves and making the tin vibrate. So the next time you hear a tin crying, remember it's just moving and making noise, not because it's feeling sad.