100:00:00,601 --> 00:00:03,362So if a photon is directedthrough a plane with two slits in it200:00:03,485 --> 00:00:06,056and either slit is observed,it will not go through both slits.300:00:06,178 --> 00:00:07,354If it's unobserved, it will.400:00:07,476 --> 00:00:09,635However, if it's observedafter it's left the plane500:00:09,758 --> 00:00:12,589