A simple HELLO! may sound cheap and common to many but to someone it is what they've been waiting for their whole lives to hear and to believe they exist. — Terry Mark Copy Share Image
On Mars, where the air is spare - a hundred times less dense than on Earth - someone could hear you scream. But you'd have to really strain to get anyone's attention. On the Red Planet, where the wind is… — Seth Shostak Copy Share Image
