toilet functions http://web.mit.edu/2.972/www/reports/toilet/toilet.html function MIT http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html upper tank portion is filling up with enough water http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html flushing system http://web.mit.edu/2.972/www/reports/toilet/toilet.html of Toilets http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html http://web.mit.edu/2.972/www/reports/toilet/toilet.html how a toilet works http://web.mit.edu/2.972/www/reports/toilet/toilet.html MIT; How a Toilet Works; Lee Knight http://web.mit.edu/2.972/www/reports/toilet/toilet.html upper tank portion is filling up with enough water