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?
How Donald Trump locked up the jerk vote
20 creative Mother's Day gift ideas
Why I'll miss Obama
WATCH LIVE: Two explosions at the Boston Marathon reportedly leave dozens injured