158 00:13:05,000 --&amp;gt; 00:13:07,400 it's a big chamber 159 00:13:07,400 --&amp;gt; 00:13:10,440 that has very, very tiny wires running across it, 160 00:13:10,440 --&amp;gt; 00:13:12,720 it's full of gas, 161 00:13:12,720 --&amp;gt; 00:13:16,320 and as particles come out of the collision point, 162 00:13:16,320 --&amp;gt; 00:13:22,280 they leave tiny traces of ions that are picked up by these wires, 163 00:13:22,280 --&amp;gt; 00:13:26,600 and then you can reconstruct the actual trajectory of each of the particles 164 00:13:26,600 --&amp;gt; 00:13:29,160 as they emerge from the collision point.