Laura Zakhar connects her son, Kevin, 15, to the "feedbag" that contains his nutrition. Lately, Zakhar has had trouble getting the calcium solution Kevin needs, in part because hospitals have been reserving limited supplies for patients who need it even more desperately than he does. Elizabeth Larkin for NPR hide caption

toggle caption Elizabeth Larkin for NPR

Seeds from Golden Rain acacias like these in Wales provide the active ingredient for a pill to help people stop smoking. Tom Patterson/Flickr hide caption

toggle caption Tom Patterson/Flickr

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