Be Amazing Toys BAT7220 Gravi-Goop Gravity-defying goop that flows uphill as it "self-siphons" from one cup to an other Add water (and some mad-scientist back-and-forth pouring) to create this ooze Use the fizzing color tablets to make the "goop" in all kinds of colors This little package makes up a ton of fun- the included powder makes a quart and a half of liquid goop Science principles explored in this kit: chemistry, applied science