Modern dual-flush toilets have become increasingly common, but many people still don't fully understand their purpose. The two buttons on these toilets aren't just for flushing-they're an innovative ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

During the past year, various vendors, entrepreneurs and inventors, promoting dual-flush conversion devices for tank-type toilets, have approached numerous water efficiency professionals, water ...