For the latest pricing and availability, check with retailers like or authorized electronics dealers. Fogbank Sassie Kidstuff Portable

It serves as an "interstage" material in nuclear warheads like the The Mystery: In the early 2000s, the U.S. government realized they had forgotten how to manufacture it

If you travel twice a month (24 trips per year) for three years (72 uses), the cost per use drops to roughly $3.45. Contrast that with buying airport food because you couldn't bring a safe play space, or paying for a hotel crib rental ($25/night). The Sassie pays for itself in two hotel stays.

You are a prepper who also happens to be a marine biologist, you have a child you want to desensitize to low-level radiation, and you enjoy explaining to TSA agents that the "silver chalk" is not drugs but a classified inertial confinement fusion medium.