Questions with the keyword 'reaction'

• how can iron rust when it touches water? by cheese2000 to Kate, Mark U, Tess, Yue Comments: (No comments so far )
• why do we yawn, is there any more to it than a bodily reaction to fatigue? by juniorscientist101 and 1 other. to Pete, David, Jonathan, Sam Comments: (so far, 2s comments )