Toxic volcanic lake reveals how life may have been possible on ancient Mars
By Ashley Strickland, CNN Near the summit of Costa Rica’s Poás volcano is one of Earth’s most acidic lakes, bright blue and full of toxic metals. The harsh conditions of Laguna Caliente, where temperatures can fluctuate between 100 degrees Fahrenheit (38 degrees Celsius) and 194 degrees Fahrenheit (90 degrees Celsius), are where a few lucky
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