Odds and ends

So my system is flawed for geocaching. I need to figure out where the failure took place, but we had some bad data. Some of it was even garbled when we got into the field. Bander and I are going to do a few more this week so my total will be over 80.

Today I am stuffy. I know. I know. Alert the media. I'm looking forward to a sneezing fit on the way home while driving. Lovely.

Finally for today a math problem. If you take a standard deck of cards (52 no jokers) in order and shuffle them perfectly 1 for 1 so that you divide the deck in half exactly. You interweave the cards one after the other keeping the top and the bottom card the same through the process. How many "shuffles" (Since the word shuffle implys randomness and this is not random I added the quotes.) does it take to return the deck to its original order? Bonus points: What if you change the top and bottom card with each "shuffle" then how many? Double Secret bonus points: What is this "shuffle" called in the circles in which it is practiced and why is it called that?