Mankind is advanced technically. Man can build space stations, can assemble them in space, and ponders about landing on Mars, but the… — Sigmund Jahn Copy Share Image
Mankind is advanced technically. Man can build space stations, can assemble them in space, and ponders about landing on Mars, but the development of… — Sigmund Jahn Copy Share Image
Only when I saw the Earth from space, in all its ineffable beauty and fragility, did I realize that humankind's most urgent task is… — Sigmund Jahn Copy Share Image
