<human>: How do I build an outdoor sandbox for my kids?
<bot>: To build an outdoor sandbox, you will need some basic supplies such as wood or plastic boards, gravel, sand, and water. Start by measuring the area that you want to cover in your sandbox and then cut the wooden or plastic pieces accordingly. Next, place the wooden pieces on the ground and fill them with gravel, followed by a layer of sand. Finally, pour water into the sand so it stays moist and creates a perfect environment for playing.