The digestive system is a group of organs (from the mouth to the rectum) that processes food so the body can use it. The following sites explain the process with illustrations and animations for all age groups.
Human anatomy is the study of the human body. The word "anatomy" derives from Greek words meaning "to cut up" because early scientists studied anatomy through dissections.
Ever wonder why the northern and summer hemispheres have opposite seasons? Or why the longest day of the year is considered the start of summer?
For elementary students, Enchanted Learning defines the terms solstice and equinox, and explains why we have four seasons.
With illustrations and animations, this online exhibit from the Liverpool Museums explains how the tilt of the Earth's axis causes the Earth's four seasons, and how a sundial works.
"The Earth spins on a tilted axis about once every 24 hours to create what we know as day and night. This axis is an invisible line through the center of the Earth."
For high school and college students, retired NASA physicist David Stern explains the earth's orbit around the sun, why we have seasons, and answers lots of related questions.
It is a common misconception that the seasons are caused by the Earth's changing distance to the sun, as it travels in an elliptical orbit around it.
Optics, the science of light, is studied by both scientists and engineers. It includes defining light, learning how it is produced, how it travels, and how it is measured. Today's picks run the gamut from simple science for K-3 students, to sites appropri
Bad science (also known as junk science, science myths or science misconceptions) consists of common misconceptions passed on from parents, teachers and inaccurate text books. As American scientist Stephen Jay Gould said, "The most erroneous stories are t
Hands-on science experiments at home or in the classroom are a fun way to engage kids and get them excited about science. Today's sites house hundreds of easy experiments that can be done with supplies that you probably have around the house, or can get a
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