Popsugar Parenting Stem Best Stem Toys 2019 49 Stem Toys That Make Learning More Fun Than Ever 9 April 2019 by Rebecca Brown View On One Page Photo 39 of 49 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 39 Thames & Kosmos 3D Sidewalk Chalk Thames & Kosmos 3D Sidewalk Chalk ($26) teaches 3D science. Thames & Kosmos 3D Sidewalk Chalk $26 from amazon.com Buy Now Previous Next Start Slideshow StemToysShoppableKid ShoppingGift GuideGifts