Online Notation Software: Flat

This is easy to use and works like google docs meets Finale.  You can write music, and you can collaborate on pieces through the web. It's all browser-based, but you have complete control over who sees (and can edit) your work.

https://flat.io/en

The Elements of Music: a full-year course in music for elementary and middle school students

Have a look!

https://sites.google.com/site/learninglynxclassroom/classes-and-extras/music-classes/music-5-the-elements-of-music

Copy editing worksheets for elementary school

http://www.alyciazimmerman.com/daily-editing-paragraphs.html

Dissect an owl pellet online

http://kidwings.com/nests-of-knowledge/virtual-pellet/

About fancy male birds

This is a great science-based look at fancy male birds.

http://biology.allaboutbirds.org/features/fancymales/fancy-males

Complete online free music school

These are the best, most clear music lessons I've ever found online.

http://www.daveconservatoire.org

Free "how to draw" book for kids

https://ia601404.us.archive.org/8/items/whattodrawhowtod00lutz/whattodrawhowtod00lutz_bw.pdf

Fun vintage "how to draw" book.