I don't know how many Gfld Prk blogers are aware of TED at www.TED.com but there is a speaker by the name of Kamal Meattle who gives some excellent information about 3 specific common house plants that generate enough oxygen to produce all the indoor fresh air we need. With our long winters and at our age we can use all the help we can get.
Its been great to get out the mountain bike and hit the trails again. Some are still snow filled but most are passable
Have a happy spring,