Seeing double: Fascinating twins

Twins pose for pictures during a photocall at the German-American Festival in Berlin, on Aug 16, 2012. -- PHOTO: REUTERS

Identical twin sisters Miss Kati (left) and Kaci Anderson from Wibaux, Montana, pose before taking part in a look-alike contest during the final day of the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 5, 2007. -- PHOTO: REUTERS

Identical twin sisters Ms Denise Garzilli (left) and Ms Diane Stillwell from Baldwin, New York, check each others' lipstick for smudges before taking part in a look-alike competition at the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 5, 2007. -- PHOTO: REUTERS

Miss Leah Majeski from Acworth, GA, reaches over to take a french fry from her identical twin sister Sarah before a look-alike contest during the final day of the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 5, 2007. -- PHOTO: REUTERS

Ms Linda Seber from Sheffield, Ohio, lifts her identical twin sister Laura before taking part in a themed dress competition at the annual Twins Days Festival in Twinsburg, Ohio, on Aug 4, 2007. -- PHOTO: REUTERS

Mr Alf Fehnhann (left) and twin brother Sven hold seven-month-old Luis Carl Millgramm (2nd left) and his brother Albert Frank (right) at the third annual twin meeting in Berlin, June 18, 2005. -- PHOTO: REUTERS

Identical twin brothers Mr Walter (left) and David Oliver from Lincoln Park, Michigan, pose during the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 4, 2007. -- PHOTO: REUTERS

Identical twin brothers Mr Don (left) and Ed Makielski from Ypsilanti, Michigan, wear matching T-shirts signifying that Don was born before Ed, during the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 4, 2007. The pair, were born on June 12, 1927. -- PHOTO: REUTERS

Identical twins Ms Janey (left) and Judy Carriuolo from Boston, Massachusetts, pose in 1920's "flapper" costumes before taking part in a competition for themed dress during the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 4, 2007. -- PHOTO: REUTERS

Identical twin brothers Isaac (left) and Owen Wonner from Petersburg, Ohio, gather before taking part in in a look-alike contest during the final day of the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 5, 2007. -- PHOTO: REUTERS

Chinese seven-year-old twins Leilei (left) and Yaoyao pose for a photograph at a park in Beijing, on July 28, 2008. -- PHOTO: REUTERS

Twin brother and sister Nicholas (right) and Olivia Saunders from Brunswick, Ohio, are pictured with their second-place medals after taking part in a competition for twins that look the least alike, during the final day of the 32nd annual Twins Days Festival in Twinsburg, Ohio, on Aug 5, 2007. -- PHOTO: REUTERS