Amy Brady is an historian and a journalist.  In her book "Ice," she investigates how frozen blocks of water have changed America.  From refrigeration to chilled drinks, medicine to skating rinks, she traces the history of something that happens naturally in the cold climates: water freezing and turning into ice.  Yet something we take for granted now, wasn't always readily available.  In Ice, Brady explains the early days of ice boxes, the luxury of ice cream, ice in cocktails and how it changed what we drink. She also looks at hockey, speed skating, figure skating and cryotherapy for breast cancer -- all possible because of ice.