A single-payer universal health care system could cover every American, save more than 100,000 lives a year, and still cost $1 trillion less than the system it

They released 500 giant reptiles into a barren stretch of the Sahara. Five years later, satellites spotted green where only sand had been.

By simulating the life cycle of a minimal bacterial cell—from DNA replication to protein translation to metabolism and cell division—scientists have opened a new frontier of computer vision into the e...