DEFENSE MECH by RAY BRADBURY - Halloway stared down at Earth, and his brain tore loose and screamed, Man, man, how'd you get in a mess like this, in a rocket a million miles past the moon, shooting for Mars and danger and terror and maybe death.

Oh, my god, do you realize how far from Earth we are? Do you really think about it? It's enough to scare the guts from a man. Hold me up. Do something. Give me sedatives or hold my hand or run call mama. A million cold miles up. See all the flickering stars? Look at my hands tremble. Feel my heart whirling like a hot pinwheel!

The captain comes toward me, a stunned expression on his small, tight face. He takes my arm, looking into my eyes. Hello, captain. I'm sick, if that's what you want to know. I've a right to be scared—just look at all that space! Standing here a moment ago, I stared down at Earth so round and cloud-covered and asleep on a mat of stars, and my brain tore loose and screamed, man, man, how'd you get in a mess like this, in a rocket a million miles past the moon, shooting for Mars with a crew of fourteen others! I can hardly stand up, my knees, my hands, my heart, are shaking apart. Hold me up, sir.

What are hysterics like? The captain unprongs the inter-deck audio and speaks swiftly, scowling, into it. I hope he's phoning the psychiatrist. I need something. Oh, dammit, dammit!

The psychiatrist descends the ladder in immaculate salt-white uniform and walks toward me in a dream. Hello, doctor. You're the one for me. Please, sir, turn this damned rocket around and fly back to New York. I'll go crazy with all this space and distance!

The psychiatrist and the captain's voices murmur and blend, with here and there an emphasis, a toss of head, a gesture:

"Young Halloway here's on a fear-jag, doctor. Can you help him?"