Online interactivity.
Level of interactivity ranges from quizzes to models and simulations that the user can manipulate. 

 A bit of history.
Science is full of intrigue, missteps, and characters. Learn more about the stage on which important and not-so-important discoveries took place.

 Hands-on investigation.
User can explore topic through an activity. 

 Assessment.
Test your knowledge with these online quizzes, response questions, process models, and other tools.

 Core content.
Examines Earth, Life, and Physical science content in detail, to re-establish understanding or to introduce new and challenging material.

 Misconceptions.
Identifies points at which understanding can go awry in science, suggests ways to avoid these points, and/or offers suggestions for addressing them when they do occur.

 Data source.
Want to conduct your own research? These troves range from tables of data to searchable archives.

 In the news.
Science as recent as yesterday's news. Puts science in the context of day-to-day events.

 Inquiry.
Encourages students to ask questions, plan and conduct investigations, use appropriate tools and techniques to gather data, think critically and logically about relationships between evidence and explanations, analyze alternative explanations, and communicate scientific arguments for debate and critique.

 Lesson idea.
An activity or exploration teachers can plug into their curriculum.

 Graphics/multimedia.
Might have pix, illustrations, movies. Generally requires plug-ins and fast connections, but the images are often worth the wait.

 Career.
A glimpse in the career paths of successful scientists and other who make a living doing science. 

 Ask an expert.
Get an answer from a scientist. Might be canned from past questions, or delayed response.