Even though you may see http://www.google.com/ in Internet Explorer's address bar, it is really http://www.google.com/index.html on the server. Index.html is the only file name invisible. However, some pages have an index2.html that you can see in an address bar.
The fifty-third second of 9:26 a.m. of March 14, 2015. So called because 3.141592653 is pi down to nine decimal places, and Pi Second is 3/14/15 9:26:53.
On Pi Second, we will play the sound of a bell ringing for all the world to hear! Pi Second is only one second out of every 100 years, so it only happens every three billion or so seconds. Enjoy the second while you can!