Best thing about this guy is that he always does exactly what you want him to do. Obviously the cylinder sucked so naturally he made a cup then squished the top closed. I started clapping in my car. He leaves no stone unturned, no questions unanswered, video after video after video. A true craftsman and an asset to the RU-vid community.
It's mostly water that's why it didn't have more of a reaction. Dry play-doh might have a stronger reaction or even catch fire but I'd guess it would just char as well.
Not enough energy in the RHNB for that, but still a good idea. A stir fry has a lot of water in its ingredients, and water has roughly 10x the specific heat or nickel (4.184 J/g K for water vs 0.44 J/g K for nickel); the ball would have to be very very hot to cook everything.
Uhhh... last time I used something like this it melted even on something as an incandescent light bulb lamp shade... not the bulb itself.... shouldn't it melt? It even became a lot more maleable and soft under nothing but body heat from my hands.