Former candidate Ben Carson arrives to attend the third and final 2016 presidential campaign debate between Republican U.S. presidential nominee Donald Trump and Democratic nominee Hillary Clinton at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mike Blake

Ben Carson introduces Republican presidential nominee Donald Trump during a campaign rally in Manchester, New Hampshire, U.S., August 25, 2016. REUTERS/Carlo Allegri

Republican presidential nominee Donald Trump advisor Dr. Ben Carson gets out of an SUV to board his plane at LaGuardia Airport in the Queens borough of New York, U.S., August 25, 2016. REUTERS/Carlo Allegri

A neurosurgeon talks with a patient undergoing a brain surgery at the National Neurology Institute in Budapest December 15, 2012. The complex operation, called deep brain stimulation (DBS) and involves stimulation of certain areas of the human brain with high-frequency electricity, is carried out with the patient awake and communicating with the doctors during certain phases of the operation. REUTERS/Bernadett Szabo (HUNGARY - Tags: HEALTH SCIENCE TECHNOLOGY)

Dario Alessandro (R), Argentina's new ambassador in Cuba, makes a toast for improved relations between the two countries as his wife Marta looks on at their Havana residence, March 23, 2005. The previous Argentine ambassador, Raul Taleb, was dismissed in December 2004 over Cuba's refusal to allow neuro surgeon Hilda Molina to travel to Argentina to visit her son and grandchildren. REUTERS/Claudia Daut CD

Norwegian neuro surgeon consultant Ostein Nygaard (R) from the University of Trondheim reacts after they fail to save the life of 11 year-old Palestinian boy Jehid Abu Shehmah during a brain operation at Gaza's main hospital 15 November,2000. Nygaard works with other Norwegian doctors as consultants to Palestinian brain surgeons and assists during operations in the hospital and in a field hospital. Jehid was shot through the head with a high velocity bullet by Israeli snipers wich caused a " brain contusion ", the medical term for a crushed brain. Doctors said there was no more hope for Jehid and would die in the next 24 hours. Palestinian hospital officials said some 7,000 Palestinians have been wounded in the violence, more than 40 percent of them under the age of 18 and at least 222 people, again most of them Palestinians, have been killed in the unrest.

Norwegian consultant neuro surgeon Ostein Nygaard from the University of Trondheim (R) talks with the head of Gaza's main hospital neurosurgery unit Basel Becker during the brain operation on 11-year-old Palestinian boy Jehid Abu Shehmah November 15, 2000. Nygaard works with other Norwegian doctors as consultants to Palestinian brain surgeons and assists during operations in the hospital and in a field hospital. Jehid was shot through the head with a high velocity bullet by Israeli snipers which caused a " brain contusion." Doctors said there was no more hope for Jehid and would die in the next 24 hours. Palestinian hospital officials said some 7,000 Palestinians have been wounded in the violence, more than 40 percent of them under the age of 18 and at least 222 people, again most of them Palestinians, have been killed in the unrest.

NORWEGIAN NEURO SURGEON CONSULTANT OSTEIN NYGAARD PERFORMS A BRAIN OPERATION ON 11 YEAR-OLD PALESTINIAN BOY JEHID ABU SHEHMAH.


Norwegian neuro surgeon consultant Ostein Nygaard (R) from the University of Trondheim reacts after an unsuccessful of 11 year-old Palestinian boy Jehid Abu Shehmah during a brain operation at Gaza's main hospital 15 November,2000. Nygaard works with other Norwegian doctors as consultants to Palestinian brain surgeons and assists during operations in the hospital and in a field hospital. Jehid was shot through the head with a high velocity bullet by Israeli snipers wich caused a " brain contusion ", the medical term for a crushed brain. Doctors said there was no more hope for Jehid and would die in the next 24 hours. Palestinian hospital officials said some 7,000 Palestinians have been wounded in the violence, more than 40 percent of them under the age of 18 and at least 222 people, again most of them Palestinians, have been killed in the unrest.

Norwegian consultant neuro surgeon Ostein Nygaard from the University of Trondheim (R) talks with the head of Gaza's main hospital neurosurgery unit Basel Becker during the brain operation on 11-year-old Palestinian boy Jehid Abu Shehmah November 15, 2000. Nygaard works with other Norwegian doctors as consultants to Palestinian brain surgeons and assists during operations in the hospital and in a field hospital. Jehid was shot through the head with a high velocity bullet by Israeli snipers which caused a " brain contusion." Doctors said there was no more hope for Jehid and would die in the next 24 hours. Palestinian hospital officials said some 7,000 Palestinians have been wounded in the violence, more than 40 percent of them under the age of 18 and at least 222 people, again most of them Palestinians, have been killed in the unrest.

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- UNDATED PHOTO - Dr. Robert Mah, of the NeuroEngineering Group at NASA's Ames Research Center, shows the NASA robot "brain surgeon", which was developed in conjunction with the Department of Health and Human Services. The technology, which was developed to help the Hubble Space Telescope see and to treat astronauts in space will be adapted to make a better mammogram and study osteoporosis under an agreement signed October 23.