Research done by U.S. scientists in the Cayman Islands suggests that native predators can be trained to gobble up invasive lionfish that colonize regional reefs and voraciously prey on juvenile marine creatures.

The invasive species with a flowing mane of venomous spines has no natural predators in the Atlantic and Caribbean Sea. Native sharks and groupers typically avoid healthy lionfish, a native to the Indian and Pacific oceans that was likely introduced through the pet trade. But when a University of Florida team tethered spry lionfish to lead weights on reefs off Little Cayman, underwater video cameras late showed nurse sharks and Nassau groupers gulping them down.

About half of all 16- to 18-year-olds coming into New York City's jails say they had a traumatic brain injury before being incarcerated, most caused by assaults, according to a new study that's the latest in a growing body of research documenting head trauma among young offenders.

Experts say the findings, published this week in The Journal of Adolescent Health, could lead to better training for correction officers on how to deal with the possible symptoms of such trauma, which include problems with impulse control and decision-making.

The White House has two words for those who want President Barack Obama to deport Justin Bieber: No comment.

Nearly 275,000 people signed an Internet petition calling the Canadian-born teen idol reckless and asking Obama to revoke his green card. That's far more than required to merit an official response through the White House's "We the People" program.

Miley Cyrus is postponing her U.S. tour while she recovers from an allergic reaction to antibiotics, but will resume her performances in August.

Cyrus' representative tells The Associated Press on Friday that the singer will resume the U.S. tour Aug. 1 in Uniondale, New York. The new dates will include seven rescheduled shows and two additional stops.

Rhode Island's Bryant University is asking students to resist the urge to take selfies with its president while receiving their diplomas.

University President Ronald Machtley (MAYK'-lee) says students ask him to take selfies on the Smithfield campus all the time. But he says having more than 800 students snap photos with him as they get their degrees will slow down the already hours-long ceremony.

Maroon 5 frontman-turned designer Adam Levine says his lack of fashion training is not a problem.

"I don't know how to read music, but I can still play. So I don't really give a (expletive) about formal training or going to school," said Levine in an interview Thursday at an event for his latest Kmart collection. "You don't have to be trained in everything to be good at it."

Eight million people have signed up for health care through new insurance exchanges and the proportion of younger applicants has increased, President Barack Obama said Thursday. The enrollments exceeded expectations and offered new hope to Democrats who are defending the law ahead of the midterm elections.

An impromptu appearance in the White House briefing room offered the president an opportunity to trumpet the new figures, which beat initial projections by 1 million. With an eye toward November, Obama castigated Republicans for continuing to seek out every opportunity to thwart the Affordable Care Act.

A man accusing singer Chris Brown and his bodyguard of punching him in the face is trying to "get rich" as a result of a bloody nose, a lawyer for the bodyguard said Thursday.

Bernard Grimm made that statement in a courtroom in Washington during the start of a trial for his client, bodyguard Christopher Hollosy, who is charged with misdemeanor assault.

German prosecutors have said they're investigating an alleged Lebanese member of a hard-line Islamic group in Syria and two suspected accomplices accused of helping him procure money and supplies.

Federal prosecutors said Thursday the main suspect is believed to have trained and fought in Syria last year with the Islamic State of Iraq and the Levant, an al-Qaida-linked group.

Eight-time champion Rafael Nadal had little trouble reaching the quarterfinals of the Monte Carlo Masters, beating Italian Andreas Seppi 6-1, 6-3 on Thursday.

Fourth-seeded Roger Federer also got through, shaking off a slow start before dispatching Czech player Lukas Rosol 6-4, 6-1 in a little under one hour.