Kathleen Rish, a senior at Port Saint Joe High School in Port Saint Joe, Florida, poses next to a sandbox cake after the completion of her eight-week internship with the research and acquisitions division of the Air Force Civil Engineer Center’s Readiness Directorate. During her internship, Rish researched biocementation, a process that uses bacteria to harden sand into rocks. (U.S. Air Force photo/Jess Echerri/Released)
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