meeting with secretary of state john kerry in the oval office this morning at white house. so the wheels start turning what that might mean. but we will know the answer at 11:45 this morning. ♪ bill: so nasa announcing it has solved one of the great mysteries about mars. where did all the water go? after years of study scientists now have an answer. mike massimino, former nasa astronaut, professor at columbia engineering school and senior advisor for the intrepid museum here in new york. what is happening. >> lots happening. bill: you say this is really cool stuff. now there is a probe called mavens right? >> yes. bill: what is maven doing? >> maven is orbiting mars and, collecting images, telling us more about the planet and discovered that after a solar flare that after it hit mars, it