Are you asking the right questions when the O2 level is below 20.9%?

We're reaching way back for this article written by John Rekus in 1999, but it's worth taking it back off the shelf for another read.  Bottom line: if your O2 levels are lower than normal, something has caused that drop.  Better be on your toes!  ow.ly/Lha5z

Now that's a battery!

2 months of continuous run time battery life!  Check out the MGC by Gas Clip Technologies.  ow.ly/KVNYc