2007-02-10 23:21:10 · 9 answers · asked by anon 2 in Education & Reference ➔ Homework Help
I'm not sure if there is such a thing. One major advance though, one that changed the landscape, is steel framing. Before that, building height was limited by masonry construction and the walls at the base had to get impossibly thick in order to bear the weight of the walls above. Think 'pyramid'. The advent of structural steel allowed weight to be carried to and borne by relatively slender columns.
2007-02-10 23:29:08 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Plumbing. Stop laughing, just hear me out. Because of plumbing, people stopped pooping and pissing in the street, and the waste was carried away. I can't emphasize enough how important this is. It greatly reduced the spread of disease and added many years to life expectancy. Also, because of plumbing, fresh, clean water was able to travel many miles to cities (IE, ancient Rome) and also improved health. Not only did people stop using the street as a toilet, but they started drinking water that wasn't contaminated by their own feces and urine.
2007-02-10 23:32:26 · answer #2 · answered by dmeyers503 3 · 1⤊ 0⤋
In my opinion, the bulldozer is the greatest invention.
2007-02-10 23:52:43 · answer #3 · answered by KBub 3 · 0⤊ 0⤋
Steel.
there are natural limits to concrete and brick that no technology can overcome. Once steel came about, the sky is the limit, almost literally.
2007-02-11 01:49:30 · answer #4 · answered by PH 5 · 0⤊ 0⤋
Cement
2007-02-10 23:28:35 · answer #5 · answered by welllaners 5 · 0⤊ 0⤋
cordless power tools
2007-02-10 23:23:45 · answer #6 · answered by Mad Maxine 4 · 0⤊ 0⤋
the wheel
2007-02-10 23:30:10 · answer #7 · answered by derf 4 · 0⤊ 0⤋
YOU ........ UDERSTAND .
2007-02-17 01:58:31 · answer #8 · answered by Anonymous · 0⤊ 0⤋