The fifth floor of Building 18 on Sunday, Aug. 30, 2026. The building was closed on Thursday, Aug. 27, following a report of dimethylmercury contamination the previous night.

Boheng Cao–The Tech

The fifth floor of Building 18 on Sunday, Aug. 30, 2026. The building was closed on Thursday, Aug. 27, following a report of dimethylmercury contamination the previous night. Boheng Cao–The Tech