Crap: Deeply craptastic crap.

Eric Metaxas: Science Increasingly Makes the Case for God – WSJ. Michael asks, ” Hey Paul, When you have a chance, would you comment on the science being presented in the article? Thanks” It’s a load of crap. Sorry if you are a fan of his work....

Mishap. Poor training.

Don’t pour molten metal into a cold mold. Maggie writes, “OMG! Does this only happen if there is some trapped moisture in the ingot?” No, it’s the same problem that glassworkers have. The thermal expansivity of aluminum is high. The cold...

On teaching physics

Rachel Hertz,  great granddaughter of Heinrich Hertz, and the only student I ever had who had a unit named after her: “I remember having a physics teacher who had us take our final exam in teams.” It’s true. I did have them take the final in teams....