Strange Universe 06/14/20
Now that warm weather is here, we're leaving windows open, which brings up the topic of our planet’s atmosphere.
The air is 78% nitrogen and 21% oxygen, which leaves just one percent for everything else. Very few know that this is almost entirely argon – an inert gas our body has no use for.
More interesting is the air’s tiny bit of carbon dioxide, since climate change has made it into a villain.