Jonas Edward Salk (October 28, 1914 – June 23, 1995) was an American medical researcher and virologist. He discovered and developed the first successful inactivated polio vaccine. He was born in New York City to Jewish parents. His personal papers are stored at the University of California, San Diego Library.
Parallels occur when two planets are at the same declination, both in the north or south. They are considered to have the same effect as conjunctions. Contraparallels are when one star in the north and another in the south are at the same declination. They are considered to have the same effect as oppositions.