To learn from the best about 3 Act tasks see Dan Meyer’s blog!
More great sites for 3 Act Tasks:
Melynee Naegele
Learning about learning and teaching mathematics.
Always Improving The Way I Teach
by Kristin Gray.
Trying to help students understand What They're Doing.
Education theories and research. Mostly.
Thoughts about Teaching Mathematics
Always Improving The Way I Teach
less helpful
Always Improving The Way I Teach
An elementary teacher's journey into middle school.
Always Improving The Way I Teach
Traditionalist Becoming Non-Traditional 