Title: handwarmer didn't work
Product review: My daughter age 9 wanted to be in the school science fair. So we looked at books from the library and picked "You Gotta Try This" because of the handwarmer experiment. We tried several times and the only warmth we got was from wishful thinking, plus a big black mess from smashing charcoal. Maybe we did something wrong, but I was hoping for something foolproof. Now we gotta think of something else in 2 weeks. HELP--PLEASE!
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