Extreme noise pollution from chain-smoking tenants? How can I reduce the noise?

Hello, I moved into an apartment in a building with several apartments. At first everything wasn't so bad. But for several weeks now, there has been a new tenant who lives directly below my apartment. So it's just one person who lives in the same building, directly in the apartment below me, and the apartments…

Why did Indira Gandhi International Airport (in New Delhi, India) choose a large-scale textile floor covering?

Hello, I've noticed it a few times, and I suspect there are probably several international airports where textile flooring is used for most of the airport area. But what might be the main reason why Indira Gandhi International Airport (in New Delhi, India) also largely relies on textile flooring? What are the advantages of such…

One bike jerks on cobblestones, another bike doesn't, does it have a figure eight?

When I ride a particular bike on a paved sidewalk (the paving stones have a relatively grainy surface, but are even, and oddly laid crosswise), the entire bike rattles. If I look at the front tire, it could be running ever so slightly, but only ever so slightly, out of true. Is it possible that…