What is the universe made of? What is the biological basis of consciousness? How long can the human life span be extended? These are just some of the as-yet-unanswered scientific questions pondered in tomorrow's special 125th-anniversary issue of the academic journal Science. Editor-in-chief Donald Kennedy and news editor Colin Norman tasked their staff to list the most challenging questions in science today and then winnow the number to 25.
Read the complete story here. (National Geographic)
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