Opioid analgesics—pain killers like morphine and codeine—are indispensable to modern medicine; they make recovery from surgical procedures slightly more bearable, and they alleviate pain in cancer patients. Opioid chemical relatives are also hugely important and include antibiotics, muscle relaxants, and cough suppressants. But these compounds are complex and difficult to synthesize, and labs can't make them nearly as well as biological systems—specifically poppies—can.