May 21, 2013 — As it roared through the Oklahoma City suburb of Moore, packing winds of up to 200 mph, the twister flattened buildings. Searchers continue to look for survivors and those who were killed.

May 21, 2013 — Sens. Tom Coburn and James Inhofe have become the faces of pushback on federal emergency spending. Now the deadly and devastating tornado in their home state has put them in an awkward position.

May 21, 2013 — Under Douglas Shulman's watch, IRS personnel singled out some conservative groups for extra scrutiny. That, he conceded Tuesday, has "justifiably led to questions" about the tax agency's motivation.

May 21, 2013 — In the aftermath of horrible acts of violence, whose faces stick in our memory? Whose faces should?

May 21, 2013 — Architects have come up with spectacular concepts for vertical farms that would grow crops in city skyscrapers. But many horticulturists think the future of vertical farming isn't in skyscrapers but rather, in large, indoor warehouses lit up magenta by super-efficient LEDs.