What happens when you expose green bean seeds to X-rays before planting them? A short burst of radiation might help seeds sprout. A long burst might stop them from growing at all. You give four groups of green bean seeds different X-ray exposure times. One group gets no radiation. The others get 1 second or 10 seconds or 100 seconds of exposure. Then you plant all four groups and measure their growth over eight days. The results reveal a surprising twist in how radiation affects germination.