Use this BMI calculator to find your body mass index from your height and weight.
This article about the origins of Halloween, tells about its Celtic origins, and also explores (see the links at the bottom) the history of trick or treating and the wearing of costumes.
Although the font makes this Pumpkin Patches and More article look as though it is only for young kids, it is appropriate for all ages, as it is well-written and includes a bibliography of sources and references.
History.com presents Halloween with links to related topics such as History of the Jack O'Lantern and full-length video episodes about monsters, vampires, and Dr. Frankenstein.
Halloween is Here tells the story of Halloween, including why we bob for apples, wear masquerade masks, and why witches ride on broomsticks.
This two-page mini-site lacks illustrations, but has a spooky-looking design that suits its subject. This article covers the story of the Jack O'Lantern and the history of Halloween costumes.
Surfnetkids.com reviews five websites that discuss the origins of Halloween.
Question and answer on any topic
The Immune System Defender Game lets you explore what happens when you are wounded, what kind of cells are involved with the immune system, and how immune cells remove bacteria.
Written for grownups, this NIAID report will be useful for high-school students writing reports, or studying for a biology exam.
This two-page KidsHealth article about the immune system is followed by a colorful printable activity ("Match the immune system cell with its function"), a video ("How the Body Works: The Immune System") and a ten-question quiz.
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