Terry Tao’s post: There’s more to mathematics than rigour and proofs

Leone Burton’s article: Why is Intuition so Important to Mathematics but Missing from Mathematics Education? ($)

Evelyn Lamb‘s article introducing readers to Bill Thurston: The Mathematical Legacy of William Thurston

A lovely video of Thurston, showing how he used his imagination, manipulatives, and diagrams to visualize mathematics. “From Knots to Narnia.”

Deborah Ball’s must-read article about manipulatives: Magical Hopes: Manipulatives and the Reform of Math Education, courtesy of American Educator: The Professional Journal of the American Federation of Teachers, v16 n2 p14-18,46-47 Sum 1992.

Figure 9.6: The Estimation Cycle

Figure 9.7: Lesson components that encourage students to build mathematical intuition

John Stevens‘s *Would You Rather?* resource (home of the quarters problem and lots of other rich tasks)

Andrew Stadel‘s fantastic resource: Estimation 180

Andrew Stadel‘s blog: http://mr-stadel.blogspot.com/

Kristin Gray‘s blog: https://mathmindsblog.wordpress.com/

Joe Schwartz‘s blogposts about Estimation 180:

- Our First Real 3-Act about mileage
- That’s Gold, Jerry! Gold!!
- Building Number Sense
- Boogers and Bloody Noses

Andrew Gael‘s blog: https://thelearningkaleidoscope.wordpress.com/