I tried to post this in the education section, however was notified I do not have access to do so? My apologies for any inconvenience. Anyways, my sister who is a 7th and 8th grade mathematics teacher wanted me to come in and teach a lesson (I suppose because she's bored and I'm a Math/Physics major.. ) and I was wondering if anyone had any neat concepts or ideas I could show them? I'm pretty sure they are just learning fractions, rationals and irrationals and factoring (7th) and slope (8th). It's tough for me because I've been dealing with upper level mathematics and would love to show off that, however, it clearly would be moot. So any ideas or demonstrations of math/physics I could show them? Thanks!