Math
Math is Fun
National Library of Virtual Manipulatives 
Math Dictionary 
Awesome Math Websites (Thanks, @crystalkirch!)

For All Educators - from My PLN 
Remind: students won't forget; keep parents informed
Next Vista - by Rushton Hurley  

Science
My Life Science Diigo group
Cybraryman's Experiments Page 


Get Your Students Moving (and maybe even outside)
Purpose Games 
Arbor Day's Tree ID Guide 
Macaulay Library of Bird Calls 

Other Sites You'll Like
My 6th Grade Diigo Group 

A+ Click Math - by topic & grade level 
Lessons for Each Common Core Math Standard
DreamBox Teacher Tools (IWB)
Calculation Nation (NCTM)  


StudyBlue: Make studying interactive & fun
The Digital Citizen Project *a must for all MS teachers


Hamilton Middle School 8th Grade Science  
The Science Spot 
Cybraryman's Science Lab Page 


Cybraryman's Geocaching Page 
Acorn Naturalists 
EEK! Environmental Education for Kids