There are many helpful sites that I have returned to time and again over the years.
Science Friday - weekly radio show on Iowa Public Radio (locally KUNI 90.9 FM) every Friday afternoon 1-3 PM. The site also has earlier episodes, a broad range of articles (searchable), videos, a book club, citizen scientists, and more.
Sky Maps - every month, download a FREE two-page guide showing the night sky, a calendar of celestial events, and a list of what to seek with the naked eye, binoculars, and telescope that month.
iNaturalist - community of naturalists and ordinary citizens reporting observations of local wildlife and flowers. Upload a photo and find out from others what that butterfly, identify milkweed for someone asking, see who has posted photos in your neighborhood.
Sorting by Casey Rule - a comparison of computer methods of sorting data. The pieces to sort are demonstrated through size, color, and pitch. Users can vary the scale, amount, tempo, and instrument to understand and enjoy the methods.
FREE Printable Graph Paper & More - sizable graph paper in squares, triangles, hexagons, rectangles and dots. Brick paper for LEGO design, penmanship pages, notebook paper, music paper, story boards, fretboard pages, polar coordinates, ledgers. Customize by both scale and color. Pages can be saved as a PDF file for reuse. I've used them for quilting, Webkinz design, Make-A-Box games, ATCs, and handwriting lessons.
Paletton - choose color combinations and view them in both website and artistic forms to find just the look you need for your next projects. Save color combinations for later use. Store data in RGB and hex formats. Make your own paint swatches and compare color pairings within your palette.
Inspirograph - online version of the classic gears drawing tool Spirograph. Choose your fixed and moving gears, choose your colors and draw.
Science Video Series: There are many sources for science-based learning through live-action or animation. These can be found on video sites like YouTube and Vimeo, on DVDs at your local library or online shopping, or on streaming services such as Netflix or Hulu. The sources change, so I cannot list specifics, but please use search engines to find current links.
The Magic School Bus (+ books)
The Magic School Bus Rides Again! (Netflix)
Bill Nye, the Science Guy
Crash Court Kids (YouTube)
Schoolhouse Rock (Disney+)
DIY Sci with Steve Spangler
Sid the Science Kid (youngsters)
FETCH! with Ruff Ruffman
Wild Kratts + Zaboomafoo
Bill Nye Saves the World (Netflix)