Ender's Game (Ender Wiggins Saga)

beings doesn't mean they weren't killing human beings. We do have a right to defend ourselves as best we can, and the only way we found that works is killing the buggers before they kill us. Think of it this way. In all the bugger wars so far, they've killed thousands and thousands of living, thinking beings. And in all those wars, we've killed only one.”
      "If you hadn't killed the queen, Mazer, would we have lost the war?”
      "I'd say the odds would have been three to two against us. I still think I could have trashed their fleet pretty badly before they burned us out. They have great response time and a lot of firepower, but we have a few advantages, too. Every single one of our ships contains an intelligent human being who's thinking on his own. Every one of us is capable of coming up with a brilliant solution to a problem. They can only come up with one brilliant solution at a time. The buggers think fast, but they aren't smart all over. But on our side, even when some incredibly timid and stupid commanders lost the major battles of the Second Invasion, some of their subordinates were able to do real damage to the bugger fleet.”
      "What about when our invasion reaches them? Will we just get the queen again?”
      "The buggers didn't learn interstellar travel by being dumb. That was a strategy that could work only once. I suspect that we'll never get near a queen unless we actually make it to their home planet. After all, the queen doesn't have to be with them to direct a battle. The queen only has to be present to have little baby buggers. The Second invasion was a colony -- the queen was coming to populate the Earth. But this time -- no, that won't work. We'll have to beat them fleet by fleet. And because they have the resources of dozens of star systems to draw on, my guess is they'll outnumber us by a lot, in every battle.”
      Ender remembered his battle against two armies at once. And I thought they were cheating. When the real war begins, it'll be like that every time. And there won't be any gate I can go for.
      "We've only got two things going for us, Ender. We don't have to aim particularly well. Our weapons have great spread.”
      "Then we aren't using the nuclear missiles from the First and Second Invasions?”
      "Dr. Device is much more powerful. Nuclear weapons, after all, were weak enough to be used on Earth at one time. The Little Doctor could never be used on a planet. Still, I wish I'd had one during the Second Invasion.”
      "How does it work?”
      "I don't know, not well enough to build one. At the focal point of two beams, it sets up a field in which molecules can't hold together anymore. Electrons can't be shared. How much physics do you know, at that level?”
      "We spend most of our time on astrophysics, but I know enough to get the idea.”
      "The field spreads out in a sphere, but it gets weaker the farther it spreads. Except that where it actually runs into a lot of molecules, it gets stronger and starts over. The bigger the ship, the stronger the new field.”
      "So each time the field hits a ship, it sends out a new sphere--”
      "And if their ships are too close together, it can set up a chain that wipes them all out. Then the field dies down, the molecules come back together, and where you had a ship, you now have a lump of dirt with a lot of iron molecules in it. No radioactivity, no mess. Just dirt. We may be able to trap them close together on the first battle, but they learn fast. They'll keep their distance from each other.”
      "So Dr. Device isn't a missile -- I can't shoot around corners.
      "That's right. Missiles wouldn't do any good now. We learned a lot from them in the First Invasion, but they also learned from us -- how to set up the Ecstatic Shield, for instance.”
      "The Little Doctor penetrates the shield?”
      "As if it weren't there. You can't see through the shield to aim and focus the beams, but since the generator of the Ecstatic Shield is always in the exact center, it isn't hard to figure it out.”
      "Why haven't I ever been trained with this?”
      "You always have. We just let the computer tend to it for you. Your job is to get into a superior strategic position and choose a target. The shipboard computers are much better at aiming the Doctor than you are.”
      "Why is it called Dr. Device?”
      "When it was developed, it was called a Molecular Detachment Device. M.D. Device.”
      Ender still didn't