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Snail Eggs: Tracking the Development of...
This activity, from Hagerstown Community College, uses snail eggs to teach anatomy and development to students of varying education levels. Elementary students examine snail eggs in varying stages of development using hand lenses, dissecting microscopes, and compound microscopes and discuss basic anatomy. Middle and high school students also use lenses and microscopes to examine snail development, but go into deeper detail in discussing anatomy and physiology, including conducting some experiments on the specimens. The activity includes directions and a handout. 
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HippoCampus is an extensive online resource designed to enrich secondary and post-secondary instruction in mathematics, the natural sciences, the social...
The Many Worlds of Logic
The Many Worlds of Logic is an online learning resource authored by Paul Herrick, a professor of philosophy at Shoreline Community College in Washington state....
Mathematics Assessment Project
What are the best ways to assess student learning in mathematics? The University of California at Berkeley and the Shell Center for Mathematics Education at the...
Hall of Human Origins for Educators
The American Museum of Natural History offers a variety of helpful resources to aid K-12 educators teach human origins and evolution. Educators may want to...
Science Notebook Corner
From the California Academy of Sciences comes the Science Notebook Corner, a resource designed to help K-12 science teachers support young learners develop note...

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AMSER is funded by the National Science Foundation as part of the National Science Digital Library, and is being created by a team of project partners led by Internet Scout.
A closeup telescopic photo of a burning sun.
Bright yellow-green moss growing on a dead tree branch.
A dense ball packs more mass in the same volume, so it has more momentum at any given velocity. Thus a dense ball travels further because it loses a smaller proportion of its kinetic energy to the surrounding fluid.

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