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President Obama explores the White House science fair.

On March 23, 2015, President Obama talked with each of the young scientists and engineers about their innovative projects at the fifth-annual White House Science Fair.

Group hug with the president! #Troop411 @girlscouts #supergirls #WHScienceFair pic.twitter.com/x0AwcGEgEU
— Girl Scouts East OK (@newsGSEOK) March 23, 2015

Happy #NationalPuppyDay! This #WHScienceFair pup is celebrating with 3D-printed paws → http://t.co/h8h3EKfYki 🐶 https://t.co/WQFMyeKMVu
— The White House (@WhiteHouse) March 23, 2015

Who's that at the lectern photobomb-ing my selfie at the #WHScienceFair? 😉 pic.twitter.com/MS7yiUZB7k
— Bill Nye (@BillNye) March 23, 2015