And ... then there are lots of wonders "out there" we want to discover.
The amount of what we know is just a grain of sand on the beach of what we don't know. All the knowledge of the earth, the sea, and space will keep humans busy for centuries and centuries. Every question answered leads to many more questions.
Nasa has launched the US shuttle Discovery for a mission to the International Space Station (ISS), with seven astronauts on board.
It lifted off from the Kennedy Space Center in Florida at 2359 EDT Friday (0359 GMT Saturday).
Two previous attempts to launch the orbiter had been postponed by a mix of bad weather and a technical glitch affecting its main propulsion system.
Discovery's mission will be the 30th flight dedicated to ISS maintenance.
More information here....
Space shuttle lifts off for ISS