"And a robot," added Powell, "is essentially iron." Then, grimly: "There’s nothing like deduction. We’ve determined everything about our problem but the solution. We can’t get the selenium ourselves. It’s still too far. We can’t send these robot horses, because they can’t go themselves, and they can’t carry us fast enough to keep us from crisping. And we can’t catch Speedy, because the dope thinks we’re playing games, and he can run sixty miles to our four."