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neat tool yo understand planetary revolution in our solar system.  calculate you age on each planet.  

This is a great idea for a simple anchor chart to prompt students to find alternative answers to "I don't know"

A zoomable visual demonstration of scale.  Zoom in all the way to Plank length and out to the whole of the observable universe.   This would be an excellent jumping off point for student writing, discussion, and thinking in a science (or math) class.  Another wonderful interactive visual demonstration from Cary and Michael Huang.

RADCAB - Steps for Online Information Evaluation "RADCAB" ™ A mnemonic acronym for information evaluation Created by Karen M. Christensson, M.S. Library Media Education via Feedly

A nice site and resources for helping students (of any age) evaluate information sources. This is critical for CCSS and information literacy.

Free Technology for Teachers: 5 Good Places for Students to Find Public Domain Images via Best content in Diigo In Education | Diigo - Groups https://groups.diigo.com/group/diigoineducation

"The David Rumsey Historical Map Collection is often the first place I go to when looking for old maps to use in a social studies lesson. The collection contains more than 100,000 historical maps documenting places throughout the world. " via Feedly Collections of Historical Maps and Ideas for Using Them In Your Classroom via Free Technology for Teachers http://www.freetech4teachers.com/

The National Young Arts Foundation has collaborated with Teachers College Columbia University to create a study guide based on the HBO MasterClass series. Pursuing Your Passions is a study guide can be used in various K-12 educational settings and it offers educators a chance to embrace arts education in the classroom. Interested educators can access all the lessons and multimedia elements on the project's website and also request a free DVD copy of the study guide and the entire first season of the Emmy nominated HBO MasterClass.

From @NCTM, these math challenges are designed to bring mathematical thinking to the dinner table for families.  Teachers will also find many of these problems valuable to tackle with students to support problem solving skills and mathematical practices.  The challenges are also available in Spanish.

Article on Plagiarism with real-life examples

Great article! I think the advice here about teaching students digital research skills is absolutely critical; combatting plagiarism is a nice side-effect of this.

This Prezi on Number Systems by Petra Marjai illustrates the power of Prezi to present and explore concepts that are more difficult to convey with a traditional slide presentation.  

via TeachThought http://www.teachthought.com

A collection of statistical data sets from the National Council of Teachers of Mathematics.  Perfect for teaching Common Core Standards related to data analysis.   Use the free NCTM data analysis or spreadsheet app to work with the data.   

From the National Council of Teachers of Mathematics, a suite of "Core Math Tools," digital tools that can be used by students to model math problems for algebra and functions, geometry and trigonometry, and statistics and probability. These tools can be downloaded and run on any computer, but will not work on mobile devices.