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What is a safe level of radioactivity? If the linear hypothesis is right, then even low doses increase the risk of cancer. If it is wrong, then levels below 6 rem could be completely safe. Earlier I mentioned the natural radioactivity found in the Denver region. Let’s look at those numbers again. A reasonable estimate is that the average yearly excess in Denver (compared to the US average) is about 0.1 rem per person per year. For 2.4 million people living in Denver for 50 years, this excess amounts to 0.1 × 2,400,000 × 50 = 12 million rem, enough to cause 4800 excess cancers. That’s more excess death than is expected from the Chernobyl nuclear accident!
Physics for Future Presidents
Richard A. Muller
Teachers design a Question Focus (e.g., “Torture can be justified”). Students produce questions (no help from the teacher; no answering or debating the questions; write down every question; change any statements into questions). Students improve their questions (opening and closing them). Students prioritize their questions. They are typically instructed to come to agreement on three favorites. Students and teachers decide on next steps, for acting on the prioritized questions. Students reflect on what they have learned.
A More Beautiful Question
Warren Berger
Recognize that conflicts are essential for great relationships . . . . . . because they are how people determine whether their principles are aligned and resolve their differences.
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