U.S. Air Force Staff Sgt. James D. Ault, 312th Training Squadron instructor, right, and Airman 1st Class Christopher E. Krause, 312th TRS student, left, wave a helical spring at Lee Middle School in San Angelo, Texas, May 19, 2015. Ault and Krause showed 8th grade students how a seismometer is used to measure motion of the ground and used the spring to explain the difference between compression rarefaction, transverse and elliptical retrograde waves. (U.S. Air Force photo by Airman 1st Class Devin Boyer)

PHOTO BY: Airman 1st Class Devin Boyer
VIRIN: 150519-F-EQ901-013.JPG
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