Superman who? The Krypton Glow In The Dark Thinking Putty is definitely something that will challenge his brains as well as his might, more or less reducing him to a crumpled heap on the floor since he isn’t exactly the brainiest superhero around, and we all know what kryptonite does to him. This unique putty will glow for hours after being exposed to bright light, and each metal tin that you fork out $10.99 for will be hand packed with 1/5 lb of Krypton Glow in the Dark Thinking Putty to get you started.