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The Big Telescopes poster links ground and space based telescopes with the parts of the electromagnetic spectrum that they are observing and their locations on Earth or in space.

The poster explains how larger telescopes allow scientists to learn more about the early universe and map our own galaxy with...

This challenge, from Practical Action, requires students to design and build a model structure that will enable farmers to grow crops even in an area that may become flooded. A floating garden, built on a base of aquatic weeds, is a low cost and sustainable way of allowing people to grow vegetables. The resource...