Misc: Other than humans, black lemurs are the only primates that may have what?

Questions

Dr C. Long first used ether as an anesthetic during a minor operation?

Vincent Van Gogh, artist who always lent an ear, born?

Hyman L. Lipman of Philadelphia patented a pencil with an attached eraser?

U.S. 15th Amendment passes, guarantees right to vote regardless of race?

Frankie Laine, singer, born?