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Melissa Block talks to Jon Hamilton about the science of tornadoes.

In Texas, it may be politically unwise to cross the governor, but some politicians and advocates in the poor Rio Grande Valley are starting to speak out in support of expanding Medicaid. Gov. Rick Perry opposes all parts of Obamacare.

The deadly collapse of a textile factory in Bangladesh has heightened awareness about cheap clothes. Many Americans have become used to inexpensive clothing, but the garments are also discarded at a remarkable rate: Billions of pounds of clothing are recycled each year; nearly half is exported.

In Tampa, Fla., Tuesday, JPMorgan Chase holds its annual shareholder meeting. They will vote on a key measure: Whether to strip CEO Jamie Dimon of his title of chairman of the board. A growing number of companies have split the CEO and chairman roles.

There is word of another controversial leak investigation by the Department of Justice. The target is Fox News reporter James Rosen, who was monitored by the department after breaking a story about North Korea's nuclear weapons program in 2009.

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.

Two Central Kentucky Red Cross volunteers are heading out today to Oklahoma to assist in tornado relief work. Recovery efforts are continuing today in the…

The warning is issued by forecasters in the deadliest of situations. It was first used during a storm eerily similar to Monday's. It was 1999 and the Norman, Okla., office foretold a twister that left 46 people dead and injured 800.

A pair of sandals, a shawl and a drinking cup that were used by the Indian independence leader are among the objects going under the hammer in the U.K.

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 superefficient LEDs.