koski, known as the father of cosmonaut x he published in paper on it. and in the 1950s they do very important work on ion propulsion. you are making the entirely accurate point that engineers at hughes aircraft and elsewhere did, it was worked on by people in nassau and private industry from the 50s up until the present. so there is a rich history there of many very creative and talented people contributing to the development of it. if i suggested that jpl was the organization that developed it or thought of it, or was the only one to work on it, i did not mean to suggest that. when i set i raise the question of how could we travel around the solar system more easily and less expensively, it was that we could turn to the ion propulsion that brilliant people have been working on for nearly one century. >> it is very important for this travel, why did jpl not follow it exactly and it had such importance. >> i'd be happy to talk to about this more, but you may have some perhaps incomplete perceptions of jpl's role in the development. jpl is not solely resp

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the house expected to consider impeaching irs commissioner john koski and.he house is always live on c-span. ♪ x 100 years ago, president woodrow wilson signed the bill accreting the national park service. there is a we look tax -- look back on the past century on these historic treasures. beginning at 10 got eastern, we take you through -- to national park service is across the country. at 7:00 p.m. eastern, where life from the national park service. house, robert e. lee memorial. join us with your phone calls as we talk with robert stanton, form of national park service director and brandon buys. he will oversee the restoration of the mansion and grounds. thursday, the 100 anniversary of the national park service live from arlington house at seven clock p.m. eastern on american history tv on c-span3. >> on august 22, 1996, bill clinton signed a law aimed at reducing the number of americans who depend on welfare benefits. temporary assistance or needy families replaced a welfare program called aid to families with dependent children which had been in place