There are only a handful of people who have experienced seeing Earth from space and what lies at the bottom of the ocean, but even among those select few, Dr Kathy Sullivan has a record that is unique. She’s the only person ever to have spacewalked and visited the Challenger Deep, the deepest point in the ocean – the first American woman to do the former and the first-ever woman to do the latter. ADVERTISEMENT From hundreds of kilometers above the Earth to over 11 kilometers below the sea, Sullivan's career goes far beyond exploring. The former astronaut helped deploy…