Rotating door at hotel in Amsterdam. What mathematical questions can you ask?
Napier's Bones
Penn Kemp's pick for Mathfest.ca 2012 - Math Performance Video by our own Midtown OISE (2012) Laura!
Abacus
In any household, the refrigerator door attracts a lot of traffic. That makes it the perfect place to post puzzles for children. (Ontario Ministry of Education Parent Podcast).
Jay Ingram's pick for Mathfest.ca [Mathfest.ca] 2012 - Math Performance Video by our own Midtown OISE (2012) Kevin, Niki, Patrick and Jasmine!
The Whole of Ethan - What mathematical questions can you ask?