In researching science worksheets, I came across a comprehensive free science activity site that I just had to share it in a separate article. TSLBooks has close to 100 free printable science worksheets, activities, fill-in charts, games, puzzles and lesson plans. Each free printable science activity is available to print, simply by clicking the labeled link. Not all worksheets are preschool level but there are many that could be used for early childhood. And don't be afraid to try kids out on activities written for older kids. Grade levels are suggestions only. If your kids are gifted, early readers, don't hold them back. Preschool Science Worksheets