Video Series on the HP graphing calculators

[cdmackay]

thanks Stephen, keep 'em coming please.

Not a criticism, but for the last one, I would have preferred to see you walk-through it on the calc on-screen, rather than just having it on the white-board.

It not entirely due to my laziness — I have to keep taking my glasses off and on when I switch from calculator to screen/TV (which is a bloody pain, must get some varifocals?) so following along on my own 50g wasn't easy.

I was feeling silly with four 50g, but grsbanks makes me feel better