The list of benefits is too long to post here. That's not a copout.
Mankind has learned so much from manned spaceflight, not least of which are the medical advances. Those range from monitoring by instrumentation seen in IC wards to embedded insulin pumps, MRI technology, and much more. Then there's food packaging; that ubiquitous aluminized wrapping we now find on candy bars, potato chips, and almost everything else comes straight from spaceflight.
