Undated photo released Wednesday July 6, 2011 by Cambridge University showing dark tulip known as a Queen of the Night. The tulip’s iridescence is caused by striations on its surface which work in ... more 
Undated photo released Wednesday July 6, 2011 by Cambridge University showing dark tulip known as a Queen of the Night. The tulip’s iridescence is caused by striations on its surface which work in the same way as the micro-grooves on the back of a CD. (AP Photo/Silvia Vignolini- Cambridge University) EDITORIAL USE ONLY NO SALES less 
1 / 1
Associated Press | Photo By Silvia Vignolini- Cambridge University
Wed, Jul 6, 2011 8:46 AM EDT