title: watch as russia launches its latest superstealth submarine
text: news bulletin a common swift 
  a new study has revealed that a small bird known as the common swift can fly for  months without landing the study in the us journal current biology has confirmed an old hypothesis that these birds spend most of their lives in the air 
  scientists believe the birds which stop while flying does so only for a moment and spent  percent of the  months in the air they save energy during the day by sliding in upward currents of warm air 
  its still unclear how the birds sleep during the time but researchers believe they might catch a few winks when they fly to high heights loading