Science fair projects for two weeks or more

What to expect

Beans need about ten days to sprout, plants need a week to lean toward the window, and crystals need five days to grow. Those are the projects judges remember, because the logbook shows the work happening day by day. If your child has two weeks, start one of those first, and the countdown on My project will spread the jobs out for you.

Two weeks is also enough to do a one-day project properly: the first test, a second variable, and still a weekend left for the board. The projects that grow are listed first here, then everything else that fits.

Counted from the projects on this page: 44 about how things move, 38 about water, ice and mixing, 36 about growing and weather; 48 using kitchen things, 41 using paper, tape and toys, 29 using the outdoors and some seeds. 80 are free with what most houses have, and the rest cost about $3 or about $2 or about $1 or about $4. Testing takes from 1 to 21 days. 20 have a step a grown-up does, marked on the page.