Bioactive ingredients found in cocoa sharply reversed age-related memory decline in a group of volunteers, scientists reported on Sunday.

The compounds, called flavanols, were taken in a specially-prepared cocoa drink, according to an experiment published by the journal Nature Neuroscience.

Scientists in Denmark said Sunday they had found genetic clues to explain why a small number of children have febrile seizures -- brief convulsions -- after receiving the measles, mumps and rubella (MMR) vaccine.

They stressed there was no need to scrap the MMR vaccine -- caught in a health scare in 1998 that watchdogs later declared groundless -- and described its use as a "great achievement" in saving lives.

The seven-inch scar runs diagonally across the left flank of his skinny torso, a glaring reminder of an operation he hoped would save his family from debt but instead plunged him into shame.    

Chhay, 18, sold his kidney for $3,000 in an illicit deal that saw him whisked from a rickety one-room house on the outskirts of the Cambodian capital Phnom Penh to a gleaming hospital in the medical tourism hub of neighboring Thailand.

The U.S. ambassador to the United Nations criticized the level of international support for nations hit by Ebola as she began a tour Sunday of west African nations at the epicenter of the deadly outbreak.

Samantha Power said before arriving in Guinea that too many leaders were praising the efforts of countries like the United States and Britain to accelerate aid to the worst-affected nations, but were doing little themselves.

Alarmed by the case of an Ebola-infected New York doctor, the governors of New Jersey and New York on Friday ordered a mandatory, 21-day quarantine of all medical workers and other arriving airline passengers who have had contact with victims of the deadly disease in West Africa.

The first person to fall under the order was a health care worker returning Friday from treating Ebola patients in West Africa. By Friday evening, she had developed a fever and was being evaluated, New Jersey officials said.

Hundreds of thousands of Ebola vaccine doses could be rolled out to West Africa by mid-2015, the World Health Organization said, after a new case of the virus was reported in New York and a two-year-old girl died in the first case in Mali.

Two American nurses were declared cured of Ebola and one -- Dallas-based Nina Pham -- hugged President Barack Obama at the White House to prove it.

A 24-year-old British woman has died during cosmetic surgery at a clinic in Bangkok, prompting Thai police to arrest her surgeon for criminal negligence, officials said Friday.

The Briton died during a corrective procedure Thursday evening at a cosmetic surgery clinic in the northern Lat Phrao district of the capital where she previously underwent liposuction, police lieutenant Chaleang Inthip told Agence France Presse.

A commercial flight took off from Beijing for North Korea on Friday, despite travel agencies saying they had been told the isolated state would close its borders to foreign tourists over Ebola fears.

The Air China flight departed Beijing Capital International Airport Friday afternoon with 32 passengers on board, according to the airline's duty manager.

Australian surgeons said Friday they have used hearts which had stopped beating in successful transplants, in a world first they said could change the way organs are donated.

Until now, doctors have relied on using the still-beating hearts of donors who have been declared brain dead, often placing the recovered organs on ice and rushing them to their recipients.

A doctor who recently returned to New York from treating Ebola patients in Guinea tested positive on Thursday for the deadly virus, the first confirmed case in the city, officials said.

The 33-year-old -- identified by U.S. media as Craig Spencer -- has been placed in isolation, in what is the fourth case of Ebola diagnosed in the United States and the first outside Texas.