It all started rather innocuously. Pawlick wanted to make a very simple salad. He bought four attractive-looking tomatoes at the supermarket and discovered, once home, that they were too hard to slice. So he decided to place them on the counter, to let them ripen. They didn't. After several days, out of curiosity, he picked one tomato up, took it outside and threw it against a fence, to see how it would fare. "It bounced off, undamaged, like a not-very-springy, red tennis ball." (p.2) Why was it so? Pawlick was hooked on finding out how the answer.