When we were snowed in with a blizzard earlier this month, I was going through all our On Demand channels to try and keep us entertained. I found Activity TV. The projects they had through On Demand were pretty good, so I took a look at their website. They have many different sections, including Science. Here is a link to their science experiments:
I liked their Double Density experiment, and it's at a beginner level, so hopefully your 1st/2nd grader could do it. Hope you find something that works for you!
I would see if you can find a home school forum. There would probably be all kinds of projects for kids to do that are 1st and 2nd grade level.
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