This 32 page PDF covers lab equipment, earth science, the universe, basic chemistry, and basic physics.
SketchUp 2017 Make remains the last free desktop version of SketchUp that supports third-party extensions, making it a highly sought-after tool for hobbyists and DIYers. While Trimble (the developer) officially stopped hosting direct download links for it to focus on subscription models and the web-based version, you can still find verified installers through reputable archives. Where to Download SketchUp 2017 Make Safely