Visitors explore an imaginary time machine part of the Philadelphia International Festival of the Arts, at the Kimmel Center for the Performing Arts, Thursday, March 28, 2013, in Philadelphia. The arts festival is back in Philadelphia with a month of music, dance, theater, visual arts and family activities all loosely based on the topic of time travel. The events are scheduled to run from Thursday through April 27.(AP Photo/Matt Rourke)

Associated Press
Visitors explore an imaginary time machine part of the Philadelphia International Festival of the Arts, at the Kimmel Center for the Performing Arts, Thursday, March 28, 2013, in Philadelphia. The arts festival is back in Philadelphia with a month of music, dance, theater, visual arts and family activities all loosely based on the topic of time travel.  The events are scheduled to run from Thursday through April 27.(AP Photo/Matt Rourke)
Visitors explore an imaginary time machine part of the Philadelphia International Festival of the Arts, at the Kimmel Center for the Performing Arts, Thursday, March 28, 2013, in Philadelphia. The arts festival is back in Philadelphia with a month of music, dance, theater, visual arts and family activities all loosely based on the topic of time travel. The events are scheduled to run from Thursday through April 27.(AP Photo/Matt Rourke)
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