Online community encourages citizen science; watch privacy.
Fun games, friendly guides help kids build math fluency.
Save the planet with these terrific learning activities.
Mediocre design buries useful ozone layer facts.
Kids learn how to think mathematically and are empowered to decide how much problem solving support they want or need.
Hundreds of math activities can build skills and confidence.
Excellent resource for budding engineers.
Fun PBS site introduces kids to engineering.
Goodwill turns charitable donations into free math lessons.
Fun, smart science games and activities.
Impressive array of learning-based games and activities.
Wildlife site encourages kids to conserve.
A great way to make math a fun part of each day.
Charming site tracks kids' progress in learning games.
Learn physics while designing your own roller coaster.
Kids of all ages can indulge their sea and space curiosity.
Massive collection of fun, free, online games.
Learning games for the preschooler set are fun, fun, fun.
Have fun with anatomy using 3-D images, interactive tools.
Games and videos make exploring the brain fun.
Fun games and a strong push to buy Poptropica membership.
Ad-free pay site helps little ones get ready for school.
YouTube-like site for kids is good for play and discovery.
Semi-social site helps users collect images for inspiration.
Fun, free games -- but be prepared for some product plugs.