Online Science Experiments
Do you like optical illusions? You can learn even more science and technology and have fun at the same time when you visit the Online exhibits at the Exploratorium, San Francisco's unique science museum. You can select from 20 online exhibits with intriguing titles like Droodles, Fading Dot, Mutant Fruit Flies, Common Cents, or Shimmer.
Exploratorium
http://www.exploratorium.edu/exhibits/index.html

The Environment
You can learn about the environment from the federal agency in charge of protecting it - Environmental Protection Agency (EPA). Information and activities here focus on air and air quality; water and ecosystems; energy, natural resources, and pollution; ecology and global warming; waste and recycling, and health. There’s lots of information about environmental problems and solutions.
EPA
http://www.epa.gov/students

Severe Weather
In addition to differences in temperature, many parts of the country and the world suffer from severe weather. We often read about flooding, tornadoes, hurricanes, and other natural disasters. How do people cope during such terrible weather? Would you know what to do if a natural disaster happened where you live? The National Oceanographic and Atmospheric Administration (NOAA) provides some guidelines for us. Read the "Severe Weather Safety Guide" to get general advice on staying safe during tornadoes, flash floods, lightning, and winter storms and blizzards, hurricanes and other severe weather.
The National Oceanographic and Atmospheric Administration
http://www.srh.noaa.gov/oun/severewx/