If you’ve ever looked at your toilet flush, you’ve probably noticed two buttons instead of one, a small one and a big one. Most of us press whichever button feels right, without thinking twice. But ...

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, ...

You’ve probably noticed it a hundred times but never really thought about it– those two buttons on your toilet flush. One small, one big. You press whichever feels right in the moment, without ...

You probably press them every day, multiple times a day if you have a toilet made in the last 20 years. But many people in the UK still have no idea what the two separate buttons on top of your toilet ...

Indian households can significantly cut water usage by mastering their dual-flush toilets. Pressing the smaller button for liquid waste and the larger one for solid waste can save up to 20,000 litres ...