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## Main Question or Discussion Point

I regularly start my classes with an opener that I hope might 'spark something' in the minds of my high school physics students. This is usually the Astronomy Picture of the Day or some interesting science news article. Sometimes it is more mathematical.

On the math side, so far, I've thrown up on a slide (i) the 'proof' that ##a=2a##, (ii) ##\cos(x)-x=0, ~x=?##, and (iii) ##\lim_{n \rightarrow \infty} {\cos(x) =?}##. They loved them.

I'm looking for more math or physics teasers like these. I'd appreciate any suggestions.

On the math side, so far, I've thrown up on a slide (i) the 'proof' that ##a=2a##, (ii) ##\cos(x)-x=0, ~x=?##, and (iii) ##\lim_{n \rightarrow \infty} {\cos(x) =?}##. They loved them.

I'm looking for more math or physics teasers like these. I'd appreciate any suggestions.