Two new solar systems have been found relatively close to our own. One of them is just 160 light years from Earth and includes three planets that are remarkably similar in size to our own. One of the three is exactly the same size as our own world, and the others are only ever so slightly bigger..
South America’s Inca civilization was better at skull surgery than Civil War doctors. Trepanation — the act of scraping, cutting, or drilling an opening into the skull — was so expertly practiced in ancient Peru that the survival rate for the procedure was about twice that of the American Civil War.
