[tenant]

Smallpox may have gone but I'm fairly sure that there was a vaccine for that a very long time ago. As regards extreme poverty, I don't know that the situation in sub-Saharan Africa has improved, it may even have become worse. But I'm not doubting that there have been massive improvements in a qualitative sense to such an extent that in some ways they are revolutionary.

The 50 or so years from about 1895 gave us powered flight, radio and television, the first antibiotics, nuclear energy, rockets capable of escaping earth orbit, the big bang understanding of the origins of the universe, motor cars and even car phones. They also gave us two world wars which may be significant. By comparison the last 50 years appears rather dull, from this layman's perspective.