Recently discovered by team of researchers; have been frozen for tens of thousands of years, but are beginning to thaw, producing methane - a powerful greenhouse gas.
After an extensive manhunt one of most wanted drug lords Joaquin 'Chapo' Guzman was captured in Feb.; many argue Mexico will never hand him over to US trial system.
SECRETS OF THE DEAD looks at what the spectacular Hanging Gardens of Babylon looked like and how and how they were constsructed. Tuesday at 9 p.m. on PBS 6.
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