For a while, I’ve been sometimes feeling down, while at home. It was a feeling of unease, which is difficult to describe. But after a while, I started to get suspicious, as this feeling mainly occurred when I was running a certain fan.

I had purchased a cheapo fan from Walmart, to help me circulate the air when the weather gets hot. But I noticed that I felt unease when the fan was running, particularly when it was running at its “3” setting, closest to “off”.

I remember reading somewhere that it’s possible for a person to feel unease when exposed to a certain frequency, which is around 19 hertz. It so happens that I had a “Vibration analysis” app on my phone (developed by Dmitriy Kharutskiy), which could pick up certain frequencies.

Here is an example of how the app looks when it’s in use:

In line with my suspicion, the fan let off a vibration at around 19hz when at its high setting, “3”! I decided to measure the frequency at the “2” and “1” settings, for which it let off different frequencies.

When the fan was off, or running at a setting of “2” or “1”, my feeling of unease disappeared, almost immediately! If I were to continue to use the same fan, it would be better to avoid leaving it on the highest setting.

The Vibration Analysis app rocks! It’s very much deserving of a five star rating on the app store. Who knows what else one might discover about their environment by running this app.