Science Web Site

I came across this site in a library journal. It covers all sciences, including animal sciences, biotechnology, engineering sciences, computing, health and other subject areas we teach at BHI. An interesting feature is the ability to search the site, use an extensive index, and create an interest profile ('Alerts') so that regular emails can be sent to you regarding new links added to the site. Science.gov comes from the USA and claims to 'authoritatively select' web sites. It also claims to search the 'deep web' as well as the internet 'surface'. How deep is the internet? The mind boggles as it blogs.
http://www.science.gov/