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First lady Melania Trump made an unannounced trip to the southern U.S. border Thursday to visit children who entered the country illegally, and see the centers where they are being detained.

The trip comes a day after President Trump signed an executive order ending his controversial policy of family separation for migrant families detained as they're crossing into the U.S. illegally at the southern border.

The shooting death of a black teenager by police in the Pittsburgh area on Tuesday night has sparked protests from angry residents demanding to know why Antwon Rose Jr. was killed.

Rose, 17, was riding in a vehicle that had been pulled over because officers suspected it had been used in a shooting that happened minutes earlier Tuesday.

Video taken by a nearby witness shows two people running from the car; the sounds of three shots ring out right as another police car arrives.

Two common herpes viruses appear to play a role in Alzheimer's disease.

The viruses, best known for causing a distinctive skin rash in young children, are abundant in brain tissue from people with Alzheimer's, a team of scientists reports Thursday in Neuron. The team also found evidence that the viruses can interact with brain cells in ways that could accelerate the disease.

As she collected her Nobel Peace Prize in Oslo 21 years after it was awarded, Aung San Suu Kyi recalled her years in isolation as a political prisoner, held under house arrest by what was then Burma's ruling junta.

Speaking at Oslo's City Hall in 2012, she remembered meditating on the nature of suffering in the context of her Buddhist faith.

One of the enduring mysteries of biology is why so much of the DNA in our chromosomes appears to be simply junk. In fact, about half of the human genome consists of repetitive bits of DNA that cut and paste themselves randomly into our chromosomes, with no obvious purpose.

A study published Thursday finds that some of these snippets may actually play a vital role in the development of embryos.

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