composite image of portrait of a protected scientist dropping a liquid in a test tube

20s 30s africanwhite analysis analyze analyzing attractive background beaker biology black care chemist chemistry close closeup college computer cure development discover discovery dropper dropping examination examine experiment eyes face female file glass glasses green happy head health holding hospital instrument knowledge laboratory liquid look macro male measure medical men microbiology mid mixed occupation people physics portrait protective race research science scientist smiling space student study sutechnology team technology test transparent tube university view women work worker young