Chemistry Ig Nobel 2013 Awarded for discovering an onion enzyme that makes the eye water

The Ig Novel award 2013 for chemistry has been awarded to 

"Shinsuke Imai, Nobuaki Tsuge, Muneaki Tomotake, Yoshiaki Nagatome, Hidehiko Kumgai (Japan) and Toshiyuki Nagata (Japan/Germany)"

for discovering that the biochemical process by which onions make people cry is even more complicated than scientists previously realized. 

The award is based on a paper published in Nature in 2002 by these scientists. They studied the biochemistry of onion enzyme that works in a process producing compounds responsible for eye water. 

Congratulations!!

More on Ig Nobel here.