"We're so proud of you. Keep up the good work," Obama said to 17-year old Meghana Rao from Portland, Oregon, after she explained her project based on 'biochar' (charcoal) to the US President at the annual White House Science Fair in which around 30 student teams from across the country exhibited their projects.
Obama said these young scientists and engineers teach something beyond the specific topics that they're exploring.
This week's collection of unbelievably unusual images from across the world.
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