RT @MaxCRoser: One reason why it is hard to see that some things get better is that progress can be very slow. But over a long tim… https://t.co/gluUot0EIM

One reason why it is hard to see that some things get better is that progress can be very slow.
But over a long time changes how we live. http://pic.twitter.com/tmePOoUVD1

— Max Roser (@MaxCRoser) May 15, 2017

from Twitter https://twitter.com/DouglasHAllen