http://phys.org/news/2013-11-university-physicists-urine-splash-back-tactics.html
http://www.livescience.com/41107-physics-of-peeing-and-splash-back.html
https://www.youtube.com/watch?v=-XNDM4eAn1U
Four BYU physicists (calling themselves “wizz-kids”) have been all over the popular news for using high-speed cameras and a urination simulation apparatus to study the fluid dynamics of a broken water jet impacting a still water surface. Repeated cavitation and rapid cavity collapse produces considerable splashback. Their suggestions: either sit down, or get close, aim for the sidewall, and keep the angle low. The Smarter Every Day YouTube channel produced another fascinating indelicate video using clear tanks, Plasticine models, and high-speed photography to produce a video that is shown by MDs to children and patients susceptible to urinary tract infections (UTI) due to toilet splashback. Their unforgettable video vignette “Poop Splash Elimination” characterizes cavity production, void collapse, and jet formation, and shows how to use pieces of toilet paper on the surface to modify the surface tension to eliminate the dreaded splashback.