404. That’s an error.

The requested URL /custom?client=google-coop-np&cof=AH:left%3BS:http://physicslearning.colorado.edu%3BCX:Physics%2520Lecture%2520Demonstration%2520Websites%3BL:http://physicslearning.colorado.edu/images/ldlsmall02.gif%3BLH:47%3BLP:1%3BBGC:%23DAE0E5%3BT:%235F6A73%3BLC:%230568CD%3BGALT:%235F6A73%3BKMBGC:%23D0D1D4%3BKMBOC:%23D2D6DC%3BKMSC:%23333333%3BKMTC:%230066CC%3BKMTVC:%230066CC%3B&adkw=AELymgUYlxRHl55zcAiqOZ4mF0hdxJYO3vI-SFlSATfgL3e0azkViHHd8yk_9SH3N33izkvLW8BQQbpjSqXc8-2LGONpRWrdTWqE8oX3bSi-biLBvGfldoI&boostcse=0&ie=UTF-8&oe=UTF-8&q=simple+hologram+verification+more:demonstrations&cx=013660194988778927211:7_tiwsj5d-c was not found on this server. That’s all we know.