Online STEM Resources
Mixing in Math
http://mixinginmath.terc.edu/
Mixing in Math talks about how to combine math with Common Core Standards. Subscribing to the newsletter will give you a lot of great ideas. Warning this site has a lot of links to books or lessons you have to pay for.
Steve Spangler Science
http://www.stevespanglerscience.com/
The first link on this page is to products which are all paid resources, but the experiments show videos and they are divided into several categories such as water, color, density, and electricity. Includes
SimplySTEM
Features STEM activities for libraries and is helpfully divided by age levels. They also include family suitable activities also.
Since this is based in a library it also includes passive displays that can be viewed by patrons of the library.
PBS Kids Zoom Sci
This website includes a lot of STEM activities that are divided into the Science, Technology, Engineering, and Math sections.
The activities on this page include kid-made reviews.
STEM Friday
This blog is dedicated to reviewing STEM books and is updated every Friday. caveat: This blog is updated by several different publishing agencies including Lerner Publishing, Rourke Publishing, Capstone Connect, among others.
YALSA Stem Task Force
Includes a lot of different type of resources, but a whole section is book reviews of STEM books. YALSA leans towards recommendations for young adults rather than children, but many books and resources will cross the divide to older elementary.