These sites will help students to learn about space, plants, animals and other scientific topics.
http://www.slsc.org/ The St. Louis Science Center is a fun resource for kids and families to learn about science
http://www.missouribotanicalgarden.org/ The Missouri Botanical Gardens are a wonderful resource to learn about plants
http://www.stlzoo.org/ The St. Louis Zoo is a great place to learn about animals
http://www.ncsu.edu/imse/4/elementaryEd.htm This site has links to tons of other sites about science.