I've been working at the NYPL lately because of construction noise in my apartment building. It's a great place to work.

Quiet, and lots of good people watching.

I saw this student working problems on his VAIO laptop, and what is that black thing with the red arrow pointing to it? It's a calculator.

I used one of those in freshman year in college, but I assumed that students these days would use something on their computer.

Surprised!

PS: Here's an Amazon search for scientific calculators. They're affordable!