The world's second largest organization of physicists, APS publishes physics journals and organizes meetings.

Home page for Issues in Science and Technology Librarianship, an electronic journal from the Science and Technology Section of the Association of Co...

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections t...

Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with fr...

Twitter is without a doubt the best way to share and discover what is happening right now.

Butterflies of the World, 2000+ species illustrated. Anatomy, biology, lifecycle, taxonomy, ecology, evolution, survival strategies, migration, habit...