13-year-old Matthew Kolen, who was diagnosed with Asperger's syndrome at age eight, hugs his mother Suzanne at their home in Long Island, New York on March 30, 2012. Matthew's diagnosis will soon be dropped in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders or DSM-5, the American Psychiatric Association's diagnostic reference book, to be subsumed into the broader category of autism spectrum disorder.

Suzanne Kolen watches her son Matthew as he prepares to blow out candles on his 13th birthday cake at his home in Long Island on June 4, 2012.

Matthew sits in a room inside his house after returning from school on April 16, 2012.

Matthew looks into his fish tank on May 16, 2012.

Matthew, right, plays with a friend during his bar mitzvah in Melville, New York on June 16, 2012.

Matthew's chore list, posted on the refrigerator at his home in Long Island, on March 30, 2012.

Matthew, left, hugs his brother Russell after blowing out the candles on his 13th birthday cake on June 4, 2012.

Matthew practices Taekwondo in Long Island on April 16, 2012.

Matthew eats breakfast as his medication sits nearby at his house in Long Island on March 30, 2012.

Matthew laughs as his brother Russell plays before leaving for school on March 30, 2012.

Family members of Nasima Bibi, a female worker of an anti-polio drive campaign who was shot by gunmen, mourn at a hospital morgue in Karachi on Dec. 18.

Pakistani rescue workers carry the dead body of a female polio worker, killed by unknown gunmen, at the morgue of local hospital in Karachi, Pakistan, on Dec. 18. Gunmen killed several people working on a government polio vaccination campaign in two different Pakistani cities on Tuesday, officials said. The attacks were likely an attempt by the Taliban to counter an initiative the militant group has long opposed.

Ehsamullah, 30, left, who lost his leg after being shot with an AK-47 and Hassibullah, 30, right, who lost his after stepping on a mine, practice walking with their prosthetic limbs at the International Committee of the Red Cross (ICRC) orthopedic center on Nov. 20 in Kabul.

Afghan National Army commando, Khairuddin Sultan, 21, is helped up by his friend Ala Mohamed who joined the army with him 18 months ago, as an orthopedic specialist molds a cast for his prosthetic legs on Nov. 19. Khairuddin, a double amputee, lost his legs when an IED exploded during a joint operation against the Taliban with U.S. special forces. The IED exploded while he was using a mine detector, sending shrapnel into his outstretched hand and blowing up his legs.

Bismillah Gul, 12, suffering from poliomyelitis, is helped by his father Masta Gul, after having traveled from Khost province to get treatment on Nov. 19 in Kabul.

Khairullah, 10, watches as his brother Zainullah, 18, has a mold cast for a prosthetic arm on Nov. 20 in Kabul. Zainullah, a brick worker, lost his hand six months ago, shaping a brick from mud that contained a mine.

An orthopedic technician works on a prosthetic arm on Nov. 20 in Kabul, Afghanistan.

An orthopedic specialist checks the mobility of new prosthetic limbs being fitted on a patient on Nov. 20 in Kabul.

An orthopedic specialist fits a new prosthetic limb onto a patient on Nov. 20 in Kabul.

An orthopedic technician walks past prosthetic limbs being stored for patients on Nov. 20 in Kabul, Afghanistan.

Professional performers 'Doctor E.K.' and 'Dr. Mafalda,' members of the Red Noses clown doctors, perform in the pediatric clinic in Novo Mesto, Slovenia on Nov. 7.

'Doctor Sfrckljana' performs with a doll in a clinic for infectious diseases in Ljubljana on Nov. 7.

Members of the Red Noses clown doctors on Nov. 7.

'Doctor E.K.' performs in the pediatric clinic in Novo Mesto, on Nov. 7.

'Doctor Obizek Cvilka' and 'Doctor Zena' perform at a home for the elderly in Ljubljana on Nov. 19.

'Doctor Mally' dances with a nurse as an elderly patient watches at a care home in Izola, on Nov. 16.

'Doctor Zivalski' shows a mirror to an elderly woman as he performs at a care home in Izola, on Nov. 13.

'Doctor Zen' sings to boys in the hospital for disabled youth in Stara Gora on Nov. 5.

Patients sit inside their ward at a mental hospital in Kabul on November 11, 2012. The war in Afghanistan is creating a generation of people mentally damaged by their exposure to incessant conflict, a buildup of problems which could undermine the country's reconstruction and development efforts.

Ghazia Sadid, 26, a patient suffering from depression, speaks during an interview with Reuters at a mental hospital in Kabul on November 14, 2012.

A patient scribbles on his hand as he sits inside his ward at a mental hospital in Kabul on November 11, 2012.

Patients sit inside their ward at a mental hospital in Kabul on November 11, 2012.

Zac Vawter, who is fitted with an experimental "bionic" leg, is silhouetted on the Ledge at the Willis Tower in Chicago. Vawter, who is in training to climb to the top of the tower using the new prosthesis, recently took the elevator to the 103rd floor to see the view after an afternoon of work in the lab.

Biomedical engineer Annie Simon, left, and research prosthetist Elizabeth Halsne fit an experimental "bionic" prosthetic leg on Zac Vawter at the Rehabilitation Institute of Chicago.

Dr. Levi Hargrove, lead researcher for the Rehabilitation Institute of Chicago's Center for Bionic Medicine, holds an experimental 'bionic' prosthetic leg.

Physical therapist assistant Suzanne Finucane, right, helps Zac Vawter as he practices walking at the Rehabilitation Institute of Chicago.

A woman holds a cupcake depicting maggot therapy at the 'Eat Your Heart Out 2012' cake shop in the Pathology Museum in London on Oct. 25.

A woman eats an edible cigarette made from ginger bread at the 'Eat Your Heart Out 2012' cake shop in the Pathology Museum.

A baker puts the finishing touches to a cake depicting an injured leg on Oct. 25.

Anais Nickol, with cerebral palsy, hugs Hershey, a therapeutically trained dog, during a therapy session.

Anais Yisel (L) with cerebral palsy and Josue Salazar with autism lie on top off Fiona, a therapeutically trained dog, during a therapy session at the Colitas Foundation in Panama City.

Jazmine Raygoza, 18, a teen bariatric surgery patient, grimaces in the hot sun in the backyard of her home in Denver, April 21, 2012. Jazmine weighed 219 lbs on this day.After trying multiple diets and exercise, Jazmine, 17, decided on the Lap-Band treatment with the encouragement of her mother, who recently had a gastric bypass herself.

Jazmine Raygoza, starts to wake up in the hands of anesthesiologist Andrea Grilli , back, as Surgical First Assistant Tony Covello finishes up Raygoza's gastric banding operation at Rose Medical Center in Denver, June 20, 2011.

Jazmine Raygoza works out at the Sound Mind and Body fitness center at John F. Kennedy high school in Denver. Raygoza started a workout club with friends at the school. She was 223 lbs on this day, Feb. 16, 2012.

Jazmine Raygoza dances at her high school prom with her friend Mario Garcia in Denver April 28, 2012.

Jazmine Raygoza adjusts her cap before her high school graduation in Denver May 19, 2012.

A combination picture shows Jazmine Raygoza posing in her backyard June 18, 2011, left, and again on Sept. 16, 2012 in Denver. Raygoza lost 87 pounds since having a lap-band placed on June 21, 2011.

Teacher Wang Lijun plays basketball with Xiao Liang.

Wang Lijun instructs Xiao Liang.

Wang Lijun takes Xiao Liang home on his bike after school hours.

Teacher Wang Lijun, left, lowers the national flag as as Xiao Liang salutes.