Clark Hall was evacuated at 2:30 p.m. Tuesday after a chemical spill occurred in one of its laboratories.

Allen Kim ’10 wound his way between the congested tables of Clark Hall’s third floor. He circumvented Ernest Rutherford’s gold foil experiment. He sidestepped past some radioactive particles. He dodged some gamma rays, and evaded the nuclear forces emanating from the magnetic resonance imaging device. After scaling the steps to the fourth floor of Clark Hall, he located his homework, a contraption of gizmos, gadgets and coils that manipulates the physical properties of light. He finished his journey, and began his homework assignment for PHYS 410/510: Advanced Experimental Physics.