Calculators Online Center        http://www.martindalecenter.com/Calculators.html

Over 10,000 calculators covering every walk of life.  Cooking calculator. 

 

Astronomical Data Services     http://aa.usno.navy.mil/    

Type in a city name and find out times for sunrise, sunset, and more.

 

Geological Time Machine       http://www.ucmp.berkeley.edu/help/timeform.html

This site explains geologic time frames from the Precambrian period to today. Also has a good introduction to Geology and information on Plate Tectonics. From the University of California, Museum of Paleontology.  

 

 

Periodic Table of the Elements       http://pearl1.lanl.gov/periodic/default.htm

 

 

Click on an element's symbol to get full details about it. There is also a printable version, by clicking on "Download Area". Information includes history, sources and uses for each element. Great for those chemistry homework assignments. 

 

Species of Conservation Concern       http://www.unep-wcmc.org/isdb/Taxonomy/index.cfm

Very good database, searchable by phylum down to species, and by common name. Great for showing distribution maps of animals and plants throughout the world. Apparently covers more than just the endangered species. From the United Nations Environment Programme World Conservation Monitoring Centre. 

 

Weather Forecasts       http://www.weather.com/

From the Weather Channel, get forecasts by city, pollen counts, storm updates and more.