Well, all, okay most of the projects have been turned in, and now comes my grading fiesta (ay yi yi yi) which I solemnly do swear NOT to put off until forever and a day (p.s. I dread grading projects). I love the creativity of the students, and was impressed with some of the facts they found that they thought interesting. Here are a few of them (with no mention yet of whether they are accurate or not).
Things I've learned and would change for next time:
Be more specific about what you want on the poster (data, what work, the sentence of the prediction, the fact that the prediction has to be from using the line equation and not just the slope).
Be SUPER HAND-HOLDY on the step by step procedure of finding the equation of the line of best fit.
Grin and take Deep Breaths because even though some projects are not exactly what you were expecting, everyone still learned something about how lines are used in "life".