What everyone in the astronaut corps shares in common is not gender or ethnic background, but motivation, perseverance, and desire – the desire to participate in a voyage of discovery.

Every instrument that has been designed to be sensitive enough to detect weak light has always ended up discovering that the same thing: light is made of particles.

Every particle of dust on a patch of earth
Was a sun-cheek or brow of the morning star;
Shake the dust off your sleeve carefully–
That too was a delicate, fair face.

Have not the small Particles of Bodies certain Powers, Virtues or Forces, by which they act at a distance, not only upon the Rays of Light for reflecting, refracting and reflecting them, but also upon one another for producing a great part of the Phænomena of Nature?

Memories are not recycled like atoms and particles in quantum physics. They can be lost forever.