Next week on The Exchange, we begin with a new biography of our thirtieth President Calvin Coolidge. The stoic Vermonter known as Silent Cal. Then the one-hundredth birthday of the Federal Income tax, we’ll look at its history and controversy. Later, we sit down with New Hampshire Department of Environmental Services Commissioner, Tom Burack. And we end the week with our Friday New Hampshire News roundup. E-mail us at NHPR dot org and join us all next week for the exchange every morning live at 9/and again at 8 p m, here on NHPR!