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Whales are the largest animals on the planet, but they haven't always been giants. Fossil records show that ancient whales were much smaller than the currently living behemoths.

So when did whales get so big, and how?

A new study suggests it might be due to changes in climate that affected the food that some whales eat: krill and small fish. Instead of being spread throughout the ocean, lots of krill started being packed into a small area. Bigger whales were simply more efficient at eating the dense pockets of krill, and they beat out their smaller cousins.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Leaders of the Senate Select Committee on Intelligence say they have issued subpoenas for documents from two businesses operated by former national security adviser Michael Flynn.

Committee Chairman Sen. Richard Burr, R-N.C., and Vice Chairman Sen. Mark Warner, D-Va., in remarks to reporters, said the subpoenas were sent to Flynn Intel LLC and Flynn Intel, Inc. with a specific list of documents they are seeking. The senators did not say what to what those documents relate.

A remarkably complete fossil of a young child suggests that key elements of the human spinal structure were already in place in an ancient human relative 3.3 million years ago.

The child, about three years old, likely died suddenly and quickly drifted into a body of water, where she was covered in sediment that eventually hardened to sandstone, Zeray Alemseged of the University of Chicago tells The Two-Way.

One day after a bombing claimed at least 22 lives at a concert venue in Manchester, England, Prime Minister Theresa May has announced that the U.K. is raising its terror threat level. The move, declared Tuesday evening, means members of the British military will be deployed throughout the country to supplement its police forces.

When the Trump administration previewed its budget last March, it called it the "hard power" budget. The latest details show that it greatly increases spending on defense, veterans and homeland security, and slashes funding for major social safety net programs such as Medicaid and SNAP (also known as food stamps).

Top officials at the U.S. Department of Agriculture didn't even try to act enthusiastic as they unveiled details of their agency's proposed 2018 budget, which includes drastic cuts in spending. "We're going to do the best we can," said Agriculture Secretary Sonny Perdue. "It's my job to implement that plan."

Gunfire erupted between Philippine security forces and militants in Marawi City in the mid-afternoon Tuesday. By the time the sun had set on the small southern city, President Rodrigo Duterte had declared martial law in the region and vowed to end his diplomatic trip to Moscow early.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

President Trump's proposed budget released Tuesday rests on a key assumption: The economy will grow much faster than it has in recent years — and at a more robust pace than most analysts predict.

Health officials from more than 180 countries meeting in Geneva on Tuesday have elected a new leader for the World Health Organization.

A former health minister from Ethiopia takes over an agency that's struggled recently to find the funding and exert the political leadership it needs to tackle the world's health problems.

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