Sodastream home carbonators are displayed at the International Home and Housewares Show in Chicago. - 

This final note today in which carbonated water is featured prominently.

The big Wall Street story early today was about a company called SodaStream. It sells a gizmo that lets you turn tap water into fizzy drinks. Rumors were that Pepsi was going to buy it for $2 billion. Things got so effervescent (sorry) that Pepsi CEO Indra Nooyi personally came out and said the rumors were false.

Shares are up 78 percent the past six months. Just think of all the plastic bottles of soda water that don't get used.

Follow Kai Ryssdal at @kairyssdal