This is a great Act 1, in Dan Meyer terminology, for introducing exponential functions.
It's 40ish seconds long & totally accessible for ES, MS, & HS students.
Really good 20 minute introduction on E-Portfolio. Examples and clarification of this important work. Using E-Portfolios in secondary school as a way to have a student track his or her progress.
Add other resources in this group for e-portfolios. I think this is an interesting and exciting area of growth in classroom practice. More authentic forms of assessment.