I have two birthdays on my calendar circled with a big red marker this year. One is for my daughter, who just turned one, and the other is October 18th. That’s the day one of my closest friends turns 40. And while getting over the hill is a bittersweet bon anniversaire for most, this one is special. Because this is the day when The Clean Water Act marks its 40th anniversary. (By Alexandra Cousteau, originally posted on National Geographic's blog, Water Currents, on August 2, 2012)