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Chemistry research. Laboratory researchers filtering a chemical solution. The researcher at left is decanting the solution from a conical flask into a filtering funnel. The researcher at left is holding the filtering funnel and the round-bottomed flask that is receiving the filtered liquid. The filtered liquid can then be furthered processed using a rotary evaporator. Photographed at the Massachusetts Institute of Technology (MIT), Massachusetts, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/SAM OGDEN/SCIENCE PHOTO LIBRARY)