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Giveaways - Goodreads
LabRatGifts.com | The World's Largest Science Themed Gift Store
Giveaways - Goodreads
Giveaways - Goodreads
Science Friday
Contests for Students – NASA Jet Propulsion Laboratory
If you 'heart' trivia about the heart, enter to win a copy of 'Pump'
Win $500 for Your Science Classroom - We Are Teachers
The Ultimate Science Inspiration and Exploration Giveaway
Science Penguin Giveaways