美国有线新闻 CNN 美国转移15名关塔那摩监狱囚犯 罗切特称在巴西遭遇抢劫（在线收听）

美国转移15名关塔那摩监狱囚犯 罗切特称在巴西遭遇抢劫

play pause stop mute unmute max volume 00:0003:15repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin. The Obama administration has transferred 15 prisoners out of an American naval base in Guantanamo Bay, Cuba.

We're explaining why this is significant.

First, the facility. The U.S. operates it on land that it's leased from Cuba since 1903. Starting in 2002, the detention camp at Guantanamo Bay has been used to house suspected terrorists, that the U.S. captured from other countries, many during the wars in Iraq and Afghanistan.

Next, the controversy. Hundreds of prisoners have been held at Guantanamo or Gitmo over the years and there have been accusations that some of them were tortured or mistreated.

President Obama has said the facility is a symbol that's been used to recruit terrorists around the world. But though he's tried to bring Gitmo prisoners to the U.S. for trial, lawmakers from both major political parties have resisted that, saying the detainees are too dangerous to be held in U.S. civil prisons, and some of the former Guantanamo prisoners who've been released have returned to terrorism.

These are some reasons why President Obama has been unable to close Guantanamo, though he's tried since he took office. It's not clear where the remaining prisoners would be sent. The president also needs but does not have congressional approval to close Gitmo. Currently, 61 prisoners remained in the facility.

We mentioned on Monday how violent crimes have been one of the challenges surrounding the 2016 Olympic Games in Rio de Janeiro, Brazil. Now, the International Olympics Committee is calling for better security at the Rio events. One reason why: four U.S. Olympics swimmers, including medalist Ryan Lochte, were robbed over the weekend.

Lochte told NBC that armed men who were posing as police officers stopped the swimmers' taxi and then took their money at gun point. The swimmers were otherwise unharmed and Rio de Janeiro's police say they're investigating.

Security is not the only concerned of the athletes, though. Besides the physical conditioning they've sharpened for years, there are mental games at the Olympic Games.

DR. SANJAY GUPTA, CNN CHIEF MEDICAL CORRESPONDENT: It's the moment every top athlete for and hopes to achieve, if they don't choke under pressure.

So, just what goes on here in the brain that can keep you from doing your best and how can you stop it from happening.

The body of a highly trained athlete knows exactly what to do. Those skills are stored in muscle memory and over here, an area of the brain the Striatum. It's sort of the brain's autopilot. The key to winning is to keep the brain's thinking part, that Prefrontal Cortex area from interfering. Now, to do that, to be in that zone, means being calmed and focused.

Meditation in yoga helps slow the heart rate and calm the mind. They also turn down that thinking part of the brain.

Visualization is a tried and true approach. Feel like you're catching a basketball so that when it really happens, you've already gone through the motions. Many top athletes have learned to see the positive in pressure and then use it to their advantage. They train their amygdala, that's the brain's memory and emotion center, to associate the signs of stress to a success. In failure, they certainly don't think of that.