1) I'm honored at this request because I both truly appreciate the request and am flattered that the work I've put into Estimation 180 has inspired so many other students and educators.
2) I enjoyed the challenge to capture the essence of Estimation 180 in one or two sentences.
Based on your experience, I'm curious how you would best describe the essence of Estimation 180 in one or two sentences. I could be a jerk and have you first leave your description in the comments before I share mine... but I won't do that.
I would still love to hear your description, so feel free to add it to the comments.
Here's what I submitted:
Estimation 180 provides students with opportunities to strengthen their number sense and mathematical thinking through the use of engaging visuals and rich discourse.
The visuals at Estimation 180 allow students to engage in mathematical conversations where students are encouraged to support their mathematical claims with evidence and reasoning.