welcome:
talk about discontinuous functions
(what's a function that's discontinuous everywhere?
  continuous at just one point?)
general functions are -weird-: we don't come with good intuitions for 'em.

go over class stuff, mention bell curve instead of 70-80-90 (and why)
(make fun of GG)

questions! questions! I love questions! I'd love to swim in a vat of questions!

rational numbers as ratio of two integers.
(etymology: rational/reason/ratio, cf. french)

NO DECIMALS! NO CALCULATORS!
(exception: n+1/2 or n+1/10, it's sometimes okay: 17.5 is pretty clear)