Learn all about density. It can be a difficult scientific property to grasp, that's why we like making it colorful, fun, and (most importantly) simple! The Salt Water Density Straw is the epitome of kitchen science. You'll use materials from your house, and with just a bit of salt, you'll create a colorful experience that will have young scientists understanding density in moments. Based on the viral YouTube series called SICK Science. Recommended for children ages 10 and up.