If correcting your errors kills you, you're in for a rough ride when you finish school.
As for this post the only point I was trying to make which everyone conveiniently avoided is that mankind was living without written language, buildings or farming for 194,000 years.
You were corrected on what you said, not what you meant. Around here, everybody gets corrected. If you stay you'll find that some of the most vigorous discussions are between people on the same "side".