When regulators began looking for traces of potentially-harmful substances to ban a half-century ago, scientists were capable of finding traces as small as parts per million. Unfortunately, activists continue to panic -- and make news -- each time science improves our ability to detect minuscule traces, even if there's no new evidence these smaller and smaller traces can harm us. Now that we can detect parts per quintillion, it isn't hard to find traces of virtually any substance on the planet in virtually any place on the planet, if that's your hobby.
When regulators began looking for traces of potentially-harmful substances to ban a half-century ago, scientists were capable of finding traces as small as parts per million. Unfortunately, activists continue to panic -- and make news -- each time science improves our ability to detect minuscule traces, even if there's no new evidence these smaller and smaller traces can harm us. Now that we can detect parts per quintillion, it isn't hard to find traces of virtually any substance on the planet in virtually any place on the planet, if that's your hobby.