 1840 - Per Teodor Cleve born: discovered holmium and thulium; suggested "didymium" was not elementary; naphthalene derivatives. |
| 1840 - Per Teodor Cleve born (died 18 Jun 1905) Swedish chemist and geologist who discovered the elements holmium and thulium. He was the thirteenth child in his family. |
| 1846 - Ira Remsen born: prominent American organic chemist; founder of American Chemical Journal; first professor of chemistry at Johns Hopkins University; saccharin was discovered in his lab. |
| 1897 - John Enders born: showed polio virus was not neurotropic; Nobel Prize (Medicine), 1954. |
sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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