There are several other articles about this dating from 2016 [0][1]. Still, the articles back in 2016 also come as a big surprise for me, since I remember havin

There are several other articles about this dating from 2016 [0][1]. Still, the articles back in 2016 also come as a big surprise for me, since I remember having a kids encyclopaedia back in 1994 [2] that had a small snippet mentioning a certain migratory bird that travelled an insane distance and used warm currents that generated lift to basically take a nap mid-flight. So unless this is ruled out and not considered "flying", I really don't understand how many "first times" there have been. [0] https://www.sciencealert.com/scientists-have-just-seen-birds-sleep-while-flying-for-the-first-time-ever https://www.sciencealert.com/scientists-have-just-seen-birds... [1] https://gizmodo.com/we-finally-know-how-birds-sleep-during-flight-without-d-1784760623 https://gizmodo.com/we-finally-know-how-birds-sleep-during-f... [2] Sorry, I can't provide a source at the moment, will try to find it later. Edit: to be fair, this article is citing the ones in 2016. I found other articles from as early as 2014 [3] but maybe this is just about how for the first time the theory is actually based upon measured, empirical data. Like an article that was recently in HN about semi-automatic weapons being more deadly than non-automatic ones. [3] http://sabersabor.es/una-vida-de-record-los-10-hechos-portentosos-del-vencejo/ http://sabersabor.es/una-vida-de-record-los-10-hechos-porten...