Human: Is it safe to use a sandbox in my backyard for my children to play in? Assistant: 
It depends on the type of sand you are using and your own safety precautions. Generally, it is recommended that you supervise children when playing in any area with loose materials such as sand, dirt, or mulch. Make sure to keep an eye out for potential hazards like broken glass or sharp objects that could be hidden within the sand. Additionally, make sure to clean up any spills quickly and thoroughly so that children do not get exposed to hazardous substances.