Penicillin was discovered in London in September ... After carefully placing the dishes under his microscope, he was amazed to find that the mold prevented the normal growth of the staphylococci.

"Under the dark-field microscope they look like little snakes ... The bacterium is bizarre for another reason – penicillin still obliterates it. Shortly after penicillin's discovery about ...

Marsali comments on the fact that it looks like she’s looking at tiny paintbrushes under the microscope, signaling that Claire has in fact created penicillin. “You found it,” Marsali says.