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- Former NASA chief scientist Waleed Abdalati explores the potential of citizen science and crowdsourcing in the digital age and the challenges facing them. Whether it's tracking air and water pollution at fracking sites or using apps to fight mosquito-borne diseases, everyday people can now be active participants in effecting change.
- Scientists speculate on how life originated on earth based on the range of conditions where life survives today and the conditions that existed on the early earth. They then look for those conditions, past or present, that may exist on other planets or moons.