Science
- 61
- Lemelson Center's Invention at Play
- Play while inventing new things with imaginative online games. Has video and inventor biographies.
- 62
- Oceanography: Studies of the Ocean
- Ocean lifeforms, its tides and endangered marine habitats with homework help, video, games and quizzes.
- 63
- Old Farmer's Almanac For Kids
- Children’s version of the famous almanac with facts about weather, star gazing, moon phases and more.
- 64
- Ology
- American Museum of Natural History’s Ology is a playground for children interested in science with games, crafts and experiments on dinosaurs, marine biology, genetics and astronomy.
- 65
- Scholastic's StudyJams
- Interactive information, vocabulary and quizzes on numerous subtopics in physics, anatomy, botany, physics, astronomy, ecosystems and more for 3rd to 5th grade.
- 66
- Tox Town
- Covers toxic chemicals and health risks in various environmental settings within cities, farms, ports and on the US/Mexico border.
- 67
- Wild Music
- Interactive exploration of the science of acoustics and the sounds made by insects, birds and mammals.
- 68
- A Dictionary of Units
- A summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a standard unit.
- 71
- CyberSleuth: Units of Measurements Worksheets
- Twenty-three printable worksheets for elementary school-aged children. Focuses primarily on conversion of units of length.
- 73
- Funbrain.com
- Measurement game - Game which has several levels of difficulty for both English and metric rulers.
- 74
- GCSE Maths: Measurement
- Includes length, area and volume and the use of prefixes in units. With worked examples and animations.
- 78
- Metric Conversion Chart
- Online metric conversion calculator includes metric, US customary and Imperial unit conversions.