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Put an instrumented dummy into the spacecraft. you can measure the accelerations. measure the radiation in the environment. measure other parameters. and it's pretty much just to kind of verify what you already think you know about the environment. so, i don't think it's a critical point having that instrumented dummy in the capsule. but, you know, it's a way to get some more data. >> obviously, this brings a lot of optimism. but what are the potential pitfalls that still exist right now. >> potential pitfall is something that goes wrong with the mission. something that wasn't anticipated. we ...

Long-awaited way of travel. i'm sure you're up watching this, how significant is this launch? >> well, this is a huge deal. as you're saying this is the first american launch since 2011 of a spacecraft that could one day take astronauts to the international space station. so, this is a big deal. spacex has been developing this spacecraft for a number of years. they've gotten the rocket to be very reliable. this is an important dmi, demonstration 1, to go through basically a dress rehearsal. going to fly to the international space station dock in a few hours and come back to the earth. demonstr...