Memorials will be held today to honor two of the victims of last week’s deadly shooting at a Georgia high school. CBS News has obtained 911 calls from parents of students trying to get information in the moments after the violence unfolded. The shooting left two teachers and two students dead.
Engineers from Northwestern University revealed what they called “the world’s smallest pacemaker” on April 2, with the tiny device measuring smaller than a grain of rice.The university said the pacema...