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Here's the big question for British authorities. Why would one of their own citizens stage an attack that killed more than 20 people?

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Today, more Americans graduate high school and go on to college than ever before. But as the country becomes more diverse — the Census Bureau expects that by 2020 more than half of the nation's children will be part of a minority race or ethnic group — are colleges and universities ready to serve them?

Thousands of people in Manchester, England, defied a terror warning and poured into the streets Tuesday for a vigil honoring the victims of the Manchester Arena bombing.

A bombing the night before at an Ariana Grande concert killed at least 22 people and wounded dozens more. Authorities identified the attacker as 22-year-old Salman Abedi and have arrested several people in connection with the blast.

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.

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A large crowd gathered today in the center of Manchester, a gathering of solidarity, as the shock of last night's attack is still raw. The bishop of Manchester, David Walker, addressed the thousands in attendance from the crowd.

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 it 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.

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There's more awareness than ever of sexual harassment in workplaces, especially in workplaces long dominated by men. But there's still work to go in addressing it. We're going to explore what's happening in state legislatures.

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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.

Updated at 4:55 p.m. ET Wednesday

The Manchester Arena was packed on Monday night with pop fans eager to hear Ariana Grande perform. Her songs are bubblegum pop, so picture the crowd: kids and their parents, teenagers with their friends, fans looking for a cheerful night out.

At the end of the concert, an explosion struck near the arena. The blast killed at least 22 people and injured more than 50.

President Trump's fiscal plan released on Tuesday claims to balance the budget deficit while cutting funding for safety net programs like food stamps and increasing defense spending. Read more about budget' aims.

President Trump's proposed budget, released Tuesday, calls for a major reworking of the nation's social safety net for low-income Americans. It would impose more stringent work requirements and limits on those receiving aid, including disability and food stamps, now known as the Supplemental Nutrition Assistance Program, or SNAP. It would also give states more control of, and responsibility for, such spending.

Anti-poverty advocates have vowed to fight the budget plan, which requires congressional approval to go into effect.

Twenty percent of children who were in a car crash where someone died were not buckled in properly or were not wearing a seat belt at all, a study finds, as were 43 percent of children who died themselves.

And child fatality rates in deadly car crashes vary widely by state.

On paper President Trump's newly unveiled budget proposal is balanced. But that's predicated on an extraordinarily rosy projection for U.S. economic growth: Trump says he expects to achieve annual increases of 3 percent — a substantial boost from the 2016 annual rate of 1.6 percent.

Such pledges were a frequent theme of Trump's campaign. And they were often coupled with the observation that countries such as China and India have been enjoying fast-paced growth for years.

In the first of three matches with the world's No. 1 Go player, a Google artificial intelligence program claimed victory Tuesday. It won the round by just a fraction of a point in Wuzhen, China, but the win was enough to leave its grandmaster opponent impressed and thoroughly confounded by the result.

Justice Department ethics experts have decided Robert Mueller can proceed as the special counsel leading the investigation into the Russian government's efforts to interfere in the 2016 election, despite his former law firm's representing President Trump's daughter Ivanka and son-in-law Jared Kushner.

"Peace is a choice we must make each day," President Trump said during a visit to the West Bank city of Bethlehem, where he reiterated his resolve to help mediate a peace deal between the Israelis and the Palestinians and sounded upbeat about its prospects.

"The United States is here to help make that dream possible for young Jewish, Christian and Muslim children across the region," Trump said Tuesday as he stood alongside Palestinian Authority President Mahmoud Abbas.

Mistrust and alienation between black men and the police have become so entrenched that we need radical, sweeping change. The collective experience of black men in the criminal justice system is sobering. African Americans are 2.5 times more likely to be arrested than whites, and numerous studies have shown that black men are disproportionately targeted, stopped, frisked, and searched through the practice of racial profiling.

This story was updated on May 24 to clarify include new information on proposed cuts to Medicaid.

The proposed budget unveiled Tuesday by the Trump administration doubles down on major cuts to biomedical research; programs to fight infectious disease outbreaks; health care for the poor, elderly and disabled; and prevention of HIV/AIDS.

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