What happens if you don’t put your phone in airplane mode? - Lindsay DeMarchi

No, you're not going to cause the plane to crash, but you might screw up the cell reception for some folks on the ground as you pass by.

...and your phone's battery is going to die a whole lot faster, so be a gallant not a goofus, ok?

Smartphone "Spectrophotometer"

Sure, but what students of mine would actually have smartphones?

Oh, that's right, pretty much all of them.

It's fascinating to see what we can do with smartphones.

I may have to try this one out myself because AP chemistry now requires a Beers Law lab.