Live coverage: Two explosions rock the Boston Marathon
These were the latest updates as of 5:30 p.m. EST. For continued coverage, please follow our updates here.
The transcendental revelations of astronauts
How close are scientists to creating a real-life invisibility cloak?
Is this the safe football helmet of the future?
Donald Trump's bar-stool foreign policy
66 TV shows to watch in 2016
Why the U.S. Navy is bulking up like crazy
WATCH LIVE: Two explosions at the Boston Marathon reportedly leave dozens injured