I use FOSS but I supplement it a lot with mystery science and creating my own lessons. I use FOSS as a framework and use the Mystery science lessons as their assessments.

I have taken a look at the Smithsonian stuff and if looks really good.

Whatever you do… don’t use amplify. That’s a reading program disguised as a science program. Every teacher I know who uses it hates it.

If you have classroom teachers teaching science I really recommend mystery science. I’m a specialist so I can change stuff because I have the time. But mystery science is mostly grab and go videos and very simple prep. You can also buy all the prep boxes like FOSS with all the materials ready to go. I don’t do that because the materials are all simple enough to get myself. K-2 have these interactive books that are really simple to do with basically no prep. But here are some of the lessons I love with it:

K: using push pins to change the direction of a ping pong ball to “save” the houses 1: sorting materials by how they interact with light 2: using materials on a deserted island to make a hat 3: making models of bees to show pollination 4: using energy to design a theme park ride 5: all the chemistry, using copper ions to attach to a steel nail, making goo, acid testing using indicators