Redesigning public toilets to eliminate the danger of leaving germs on surfaces.

The article advocates installing "sensor taps" to turn the faucet on and off. This is a fine idea, if the details are done right. However, I find most sensor-controlled faucets hard to use. I can't determine exactly where the sensor is looking, so I have trouble turning the water on and off. The sinks don't bother to show where the sensor points: they expect it to be obvious, and it isn't.

Washing hands is not the only thing people do with sinks. For instance, I used to brush my teeth in a certain sink. When it was refitted with a sensor-controlled faucet, that became almost impossible.