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Hypatia was a Greek mathematician, astronomer, and philosopher who invented the hydrometer in about 400 AD. Described as a charismatic teacher, she was seen as an evil symbol of the pagan science of learning and she was eventually murdered by Christian zealots. For many women in years gone by, the invention process was fraught with danger and difficulty. Not only did they face the hardship and obstacles of inventing, they also had to contend with the sexism and gender discrimination of a male world that believed women had nothing to contribute. Scientific women came to the fore with momentous innovations which were impossible for men to ignore. During World War Two, Austrian actress Hedy Lamarr became a pioneer in wireless communications, developing a "Secret Communications System.