In pictures: The unsung women of technology

Sure, you've heard of Ada Lovelace and Grace Hopper. But how about Frances Allen, Deborah Estrin or Radia Perlman?

Yvonne Brill: Rocket scientist

Yvonne Brill developed a propulsion system, patented in 1972, to keep communication satellites from slipping out of orbit. Her inventions, which include the hydrazine resistojet, are still used today. She contributed to rocket designs that NASA used for moon missions, the first upper-atmosphere satellite and the Mars Observer, a robotic space probe.

In the 1940s, the University of Manitoba denied Brill, a Canadian, admission to the College of Engineering because it couldn't accommodate her at a required engineering camp. She instead studied chemistry and math there and earned a master’s in chemistry from the University of Southern California. Among her many honors are induction into the National Inventors Hall of Fame and receiving the National Medal of Technology and Innovation.

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