Here are my favorite references and links to science, electronics, physics, chemistry, and astronomy topics on the web. These links should be of interest to students of all ages in no particular order.

Richard Feynman (The best Physicist ever)
Professional Societies
Joining one or more professional society will give you a sense of what a particular professions is all about. It's one helpful way of figuring out what to major in.
Science
World Science Festival (a small bit of content here may be for mature audiences so check it out first)
Ted (some content may be for mature audiences so check it out first)
Maker Faire (lots of really great talks)
Arduino (microprocessor kit to learn programming and make stuff move)
Books of interest to engineers and scientists (Sci-fi, fiction, & non-fiction)
  • Ringworld and Ringworld Engineers by Larry Niven
  • Neuromancer by William Gibson
  • The Foundation series Isaac Asimov
  • 2001 A Space Odyssey Auther C. Clarke
  • Hitch Hikers Guide to the Galaxy (series) Douglas Adams
  • Rendezvous with Rama by Arthur C Clarke
  • The Pale Blue Dot by Carl Sagan
  • Jedi Academy Trilogy series books (available from the library most likely)
  • Making Things Move by Dustyn Roberts
  • What do you care what other people think? by Richard Feynman
  • Yeager: An Autobiography by Chuck Yeager
  • A Short History of Nearly Everything by Bill Bryson
  • The Heechee Saga by Frederik Pohl
  • Dune (Original Series) by Frank Herbert
Electronics Circuits
Software/Tools
Personal Factories make the stuff you design with Sketchup and Inkscape
  • Ponoko personal factory — 2D laser cutting & 3D printing
  • Shapeways 3D printing
LEGOs
  • LEGOs in space Check out this video of astronaut Don Pettit using LEGOs for a neat science experiment on the space station.
  • LEGO Builder This website that lets you build LEGO structures. It looks really cool.
Aerospace
  • Zooniverse hunt for exoplanets or check the other cool citizen science projects
  • NASA Wavelength
  • SpaceX The link below will take you to an interview with the CEO of SpaceX who builds commercial rockets.
  • SpaceShipTwo The link below will take you to an interesting article about the design, development, test, and manufacturing of the SpaceShipTwo and WhiteKnightTwo. Both craft are made of carbon-fiber composite materials. The carbon fiber fabric does not make corners well so the both craft have very few corners. This is an excellent example of how your material drive your design
Google Science Fair
The Google Science Fair has started. The deadline for final submission is April 30, 2013. Some of the winning entries have been really cool. If interested you can find out more about it at the links below. The grand price is a $50,000 scholarship from Google. It's easy, just go to the website at the first link and press the start button/icon. Create a gmail account if you don't have one and then follow the directions. There will be a bunch of google+ hangouts that will help you along the way. The second link will give you some information about the fair.
Nanotechnology