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Time for something a little different - @richcampbell talking about returning to the moon and what developments in science this might bring. #ndcoslo 
A lot of space tech has its roots in military designs. All early American rockets except the Saturn V were repurposed ICBMs
Water and other elements were proved to exist on the moon by essentially throwing a spacecraft the size of a bus at it
Sending humans to Mars is not particularly viable due to long term effects on the body when living in free-fall
We can produce gravity on a spacecraft using a centrifuge. More gravity requires a larger centrifuge, increasing costs
The moon provides an opportunity to experiment with how the human body functions in low gravity (1/6 of 1G) for extended periods
Putting a space station in lunar orbit gives us a staging post for lunar missions and orbital construction efforts
