For science and math teachers, finding high-quality resources can sometimes be a challenge. But the great news is that there are lots of organizations out there to help you find the best sources for your students.
The National Science Teachers Association (NSTA) publishes a list every year of the outstanding science trade books published for K-12 students. I look forward to the list every year to use to add to my classroom library.
Nonfiction Detectives is an awesome blog reviewing new nonfiction books. Here's their "Best of" list from 2014, which includes a science section. The 2012 list includes some math books too.
Sometimes, though, books are more text than you're looking for. The Electronic Library for MN (ELM) is an amazing resource for teachers. Not only can you search for nonfiction articles to supplement your own learning about new topics, the databases have been culled to provide the best nonfiction resources for your students too. Check it out - it's free!
Where do you find the best nonfiction resources for science and math?