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A U.S. probe cost $637 million to get to Mars; an Indian mission cost about a tenth as much. There are at least a few reasons why, both teams agree — starting with the differing shapes of each orbit.

The astrophysicist has been tweeting about the science behind the film. In an interview with NPR, Tyson goes beyond those tweets, into wormholes, relativity and even some spoilers.

Six banks, including Citigroup, Bank of America and J.P. Morgan Chase, will pay regulators more than $4 billion to settle charges they manipulated the currency exchange market to boost profits.

One of the largest public school systems in the U.S. dropped religious affiliations for holidays on its school calendar. The decision represents a classic church and state battle.

The so-called Islamic State is known for its social media savvy, but they also use more traditional propaganda: a flag. Tess Vigeland talks with vexillologist Ted Kaye about its design and history.

Charleston Mayor Joseph Riley is retiring after 10 terms. "I sought this job ... mainly to help build a bridge between the African-American and the white community," he says.

An independent review of how the FBI implemented the recommendations made in the 9/11 Commission Report also says new threats to the U.S. challenged the bureau's "change-resistant culture."

The president defends his economic track record, even as Republicans are trying to change the government's fiscal course. House and Senate committees unveiled draft budgets that would cut spending.

Benjamin Netanyahu's re-election is likely to cause President Obama more headaches when it comes to dealing with Republicans, the Iran negotiations and the Israeli-Palestinian peace process.

The rate at which the ice is shrinking at the ocean's edge in the West Antarctic has increased by 70 percent over the past decade, an analysis of satellite measurements suggests.