dr. cordova. >> thank you. madam chair, ranking member shelby, members of the committee, and senator cochran with who i have worked. i want to thank you for the opportunity to testify about the national science foundation and the critical role that plays in keeping the nation at the forefront of the world's science and engineering enterprise. it is personally grad identifying for me to appear before you as nsf director because full disclosure, i have had the pleasure of testifying in the presence of senator mccull ski before. almost two decades ago i was at the witness table as the chief scientist, in this role i encouraged scientists to never us pas the biggest challenges the agency could tackle. they identified trying to understand the origin of the universe through observation, identifying habitable planets orbiting other suns and visiting the neighborhoods of our sun and planets to better understand their nature and origins, and today, they have certainly made a lot of progress on all of those big challenge