MATH, SCIENCE

Mathematics
http://mathforum.org/dr.math/dr-math.html Ask Dr. Math
http://www-groups.dcs.st-and.ac.uk/~history/ History of Math
http://www.maths.usyd.edu.au:8000/MathSearch.html Research level and university math
http://sln.fi.edu/tfi/hotlists/math.html Math Gateway
http://school.discovery.com/schrockguide/math.html Math resources for all ages
http://mathworld.wolfram.com/ Links to Math sites

General Science Sites and Gateways
http://www.exploratorium.com/ The Museum of Science, Art and Human Perception
http://www.si.edu/ Smithsonian Online
http://www.discovery.com Discovery Online
http://www.enature.com/ Online Field Guides
http://www.fs.fed.us/ U.S. Forest Service official website

Chemistry and Science
http://www.chemicalelements.com/ Periodic Table of elements
http://www.library.ucsb.edu/subj/chemistr.html Chemistry links
http://www.physicstutor.com Physics tutor
http://www.carnegielibrary.org/subject/homework/physics.html Physics links

Astronomy and Space
http://www.nasa.gov Official NASA site
http://www.astronomy.net/ Astronomy images, articles, etc.
http://scienceworld.wolfram.com/astronomy/ Links to planets, etc.
http://antwrp.gsfc.nasa.gov/apod/astropix.html Nasa's Astronomy Picture of the Day
http://www.sciencedaily.com Links to latest scientific discoveries in all disciplines.

Paleontology
http://www.ucmp.berkeley.edu/ Musuem of Paleontology

Biology
http://www.ornl.gov/hgmis/ Human Genome Project Information
http://www.wvu.edu/~agexten/ipm/identify/insectid.htm Online insect identification

Endangered Species
http://endangered.fws.gov/index.html U.S. site of endangered species
http://www.dcnr.state.pa.us/wrcf/pubindex.htm Endangered and Threatened Species of PA

Plants
http://plants.usda.gov/ Plants database from the USDA
http://www.dcnr.state.pa.us/forestry/commontr/common.htm Common trees of PA
http://nnlm.gov/pnr/uwmhg/index.html Medicinal herb garden
http://www.il-st-acad-sci.org/trees/leaf.html Leaf identification
http://www.arborday.org/trees/treeID.html Tree identification guide

Earth Science
http://sln.fi.edu/tfi/hotlists/geology.html Earth science links
http://mbgnet.mobot.org/sets/ Biomes and Ecosystems
http://www.nws.noaa.gov/ National Weather Service
http://www.weather.com Weather Channel
http://volcano.und.nodak.edu/vw.html Volcanoes
http://quake.wr.usgs.gov Earthquakes
http://www.npca.org/National Parks Conservation