"Edheads is an online educational resource that provides free science and math games and activities that promote critical thinking. Choose from Simple Machines, Virtual Knee Surgery or Stem Cell Heart Repair, among others. All activities meet state and national standards."

"The Acme Tennis Ball Company is designing a new box to ship its products. The marketing department wants a triangular box that can hold 4 balls, as in the illustration below."

" story of Sophie Germain, an 18th-century woman who assumed a man's identity in order to pursue her passion-attempting to prove Fermat's Last Theorem."

"What it is: Numberphile is a series of "numberly" videos by Brady Haran. This is the same guy behind some other great projects including periodicvideos and sixtysymbols. These videos reveal some of the mystery behind numbers and math in fun, short snippets! I could give a long, drawn out explanation about the site…but really, you should go have a look and play a few videos."

Plan Ceibal has
a separate Khan Academy Web site at http://khan.ceibal.edu.uy/ where they
are apparently hosting 1,100 (!) videos which have been translated to
Spanish:

"Have you ever tried to guess how many pieces of candy there are in a jar? Or tackled a mindbender like: "How many piano tuners are there in Chicago?" Physicist Enrico Fermi was very good at problems like these -- learn how he used the power of 10 to make amazingly fast estimations of big numbers."

"Algebra 1-An Open Course - NROC's Algebra 1 course is designed to be used with first-time algebra students at a broad range of ability levels, from remedial to advanced. The content is correlated to all US state algebra frameworks and The Common Core. This course can be used as a stand-alone curriculum or as a supplement to any algebra textbook."

"Math in the News
Current events, as seen through the prism of mathematics: This is what "Math in the News" brings every week. We look through stories that make today's headlines and extract the mathematical story underlying it."

"Take a Spin on the Centrifuge (MIT Engineering K-12 Video Pilot)
This video uses Man-Vehicle Lab's human centrifuge to discuss centripetal force and countermeasures for astronaut bone and muscle loss in space. It shows the mathematics required to calculate centripetal force, and performs an experiment on the centrifuge with an "astronaut.""

"As students are working through their various build sessions, we pause ocasionally to talk about the variables they are changing (independent), the expected outcome (dependent variable), and the records and/or graphs they are keeping on the flight times of their rocket (data collection and repeatable expeirmentation)."

" kids keep coming back for more and more play time. We loved their statement, "Let's show our children that Math and Science can be loved." Numerosity may not have coined the term Gameful Learning, but they refer to it often and explain it as a way to engage and empower learners by placing them in the driving seat."

"Flipped to the MAX! What if the application (the homework) was done in class with teacher guidance and the lecture for the next day's lesson/application was given for homework? This is the basic concept of the flipped classroom. More time can be given for assistance if warranted or extensions if the concept is demonstrated as mastered."

"StoryMath™ is an innovative new approach that uses storytelling to present math in a fresh, fun and exciting light. Reading and listening to our stories will stimulate students' imagination and help them learn useful vocabulary. Moreover, seeing math in this new context enables a deeper understanding of concepts - and helps remove the fear of the subject. "