Today he's thinking about forks.
Why does the fork have four tines? The Evolution of Useful Things has an explanation of how the fork came to be, but not a coherent explanation as to why the number stopped at four. More tines would clearly be better, because it would require less force to skewer food and hold it in place better. It appears to be an engineering limitation ...He goes on to do the math for what kind of materials could have how many tines, talking about the advantages and disadvantages of titanium, Lexan, and (perhaps thinking of the Young Lady's Illustrated Primer) sapphire.
I think I disagree that more tines would be be better. The tines would of course have to be narrower, which it seems might interfere with the fork's food-platform function.