Probably a failure of the school system:
http://www.theguardian.com/music/2016/jan/25/bob-rapper-flat-earth-twitter
and a funny answer:
http://www.theguardian.com/science/brain-flapping/2016/jan/26/earth-totally-flat-conspiracy-bob
http://www.theguardian.com/music/2016/jan/25/bob-rapper-flat-earth-twitter
and a funny answer:
http://www.theguardian.com/science/brain-flapping/2016/jan/26/earth-totally-flat-conspiracy-bob