| 1 | Before those injections, the mice scratched vigorously. | |
| 2 | Scientific advances are also creating wool that doesn't itch or shrink. | |
| 3 | When one of them rolled over for a scratch, I knew I had made the right move. | |
| 4 | When scientists set out to trace the roots of human laughter, some chimps and gorillas were just tickled to help. | |
| 5 | The globe on fire, the earth in blood and forgotten my peaceful evening by dint of itching, fighting, hunting, scanning the ceiling and the starry sky! |
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