Acoustic is an important factor for the ergonomic design of workplaces. I was reminded of that when I started working on my laptop at my new desk. The noise of the laptop’s ventilator happened to be in such a frequency that interacts with that of the desk surface. Resulting, the desk worked as sound box. Whenever I put the laptop on the desk it started to produce very low but still noticeable humming sound, just above the hearing threshold level….