Kids can watch colorful crystals grow with this NatGeo kit, on sale for Prime Day

Get up to 20% off National Geographic STEM science kits, including a crystal growing kit, a glowing marble run and more.

Source: https://www.livescience.com/news/kids-can-watch-colorful-crystals-grow-with-this-natgeo-kit-on-sale-for-prime-day