The 120th Carnival of Education is now up and running at I Thought a Think. As always, a wide variety of interesting articles to browse. Enjoy!
Edited to add: Oops! I missed the 8th Carnival of Mathematics last week.
My favorite posts mostly came in pairs.
Two puzzles from MathNotations:
When Curves Collide
Going off on Tangents
Two brainteasers from SharpBrains:
The Unkindest Cut of All
The Really, Really, Really Big Number
Two mind-blowing infinity puzzles that were fun to read, even though I didn’t really understand the answers:
Cats in a Tree
Dogs in a Mineshaft
And the odd-one-out is a history post:
Calculators: Past, Present and Future
Denise Gaskins' Let's Play Math 