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Purdue civil engineering doctoral student Lisa Choe works with graduate student Sungwoo Oh in using a one-of-a-kind heating system to study the effects of fire on steel structures. Research assistant Michael Bratt, far left, looks on. The work is led by Amit Varma, a Purdue associate professor of civil engineering (green hardhat), seen here with graduate students Erica Fischer and Kristi Selden. (Purdue University photo/Mark Simons)