“To Strengthen Teaching in Public Schools” is their motto. Simple and clear.
Yep, it’s true. They are all free! There are literally thousands of lessons here – hundreds of them are in science, as well as in literature and other areas. There were written over the years by teachers from several summer science institutes. Most of them have a written abstract, a narrative, objectives, worksheets, grade levels and references. Don’t let the name “Yale” scare you – this site is really quite friendly to use.
You are given three choices; I would start at the top one “Search Curricular Resources from Local and National Seminars” and click on “search”.
This might easily become one of your biggest resources for you science classes.