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Gr 4–6—Solving nothing and providing precious little hard science, these expeditions into the land of woo offer gatherings of unsourced anecdotes and speculative references to possible causes of supernatural phenomena, from weather or physical forces to gravity waves, aliens, or outright hoaxes...
Gr 7—10—These information-packed guides have a clear message: When it comes to being eco, you don't have to do everything, but there is no excuse for doing nothing...