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Leave part of the yard rough. Don't manicure everything. Small children in particular love to turn over rocks and find bugs, and give them some space to do that. Take your child fishing. Take your child on hikes.

"Saving Kids from 'Nature Deficit Disorder'". "Morning Edition" with Steve Inskeep, www.npr.org. May 25, 2005.
Leave part of the yard rough. Don't manicure everything. Small children in particular love to turn over rocks and find bugs, and give them some space to do that. Take your child fishing. Take your child on hikes.