VIENNA, Austria – Vienna's subway tracks cracked, German authorities shut a key canal to ships after it iced up, and a zoo moved its penguins indoors Tuesday as a deadly deep freeze tightened its arctic grip on much of Europe. The killer cold wave, which has been blamed for more than 50 deaths in Russia, claimed at least 13 lives in the past five days in the former Soviet republic of Moldova, where authorities said another 30 people – many of them homeless – were hospitalized with hypothermia. Romanian authorities reported 15 deaths in the past few days, five of...