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Urinal Dynamics: a tactical guide [Brigham Young University Splash Lab via Phys.org]
Men should stand as close to the urinal as possible… Also helpful is directing the stream to hit the back of the urinal at a downward angle. That creates less splash-back and the drops that do bounce, head downwards into the urinal drain. Conversely, to prevent messing one’s trousers (or angering neighbours) they suggest men not spray directly into the urinal or into the pool that forms at the bottom of the urinal, both cause a lot of splash-back.
Urinal Dynamics: a tactical guide [Brigham Young University Splash Lab via Phys.org]