Willful ignorance is no excuse. To take but a single example: "It used to be [that] it is accepted scientific wisdom the Earth is flat, and this heretic named Galileo was branded a denier."
Ah, no it wasn't. Not by the majority of those who were remotely scientific.
The greeks knew Earth was round and, in fact, had calculated its circumference to within a few hundred miles. Eratosthenes figured this out a couple of hundred years BCE (see link below).
Hey Senator Cruz: "Get your facts first, then you can distort them as you please." -- Mark Twainhttp://en.wikipedia.org/wiki/Eratosthenes