Penicillin nontoxic in humans by first performing toxicity tests in animals and then on humans. His subsequent experiments on penicillin's response to heat and pH allowed Fleming to increase the stability of the compound. The one test that modern scientists would find missing from his work was the test of penicillin on an infected animal, the results of which would likely have sparked great interest in penicillin and sped its development by almost a decade. The importance of his work has been recognized by the placement of an International Historic Chemical Landmark at the Alexander Fleming Laboratory Museum in London on
Saint Valentine Saint Valentine Saint Valentine (, ), officially Saint Valentine of Rome, was a widely recognized 3rd-century Roman saint commemorated on February 14 and since the High Middle Ages is associated with a tradition of courtly love. All that is reliably known of the saint commemorated on February 14 is his name and that he was martyred and buried at a cemetery on the Via Flaminia close to the Ponte Milvio to the north of Rome on that day. It is uncertain whether Saint Valentine was one individual or a pseudonym for several. Several different martyrologies have been added to later