6. And Don’t Miss . . .
- “Radioactivity decreases predictably over time. That’s why we can tell the age of rocks, fossils, and prehistoric artifacts by the activity of radioactive atoms within them, and why nuclear waste becomes less toxic over time.” A fascinating New Scientist article reviews ongoing investigations into the link between the earth—sun distance and radioactive decay rates.
Solar ghosts may haunt Earth's radioactive atoms [/b]