Can you tell a 15kHz sine wave from a 15kHz sawtooth wave? A CD can't, because there are only three samples per crest and almost every teenager can easily hear 15kHz.
Even a teenager cannot tell the difference between a 15kHz sine wave and a 15kHz sawtooth wave. The first harmonic of a 15kHz sawtooth wave above the fundamental frequency is at 30kHz. Please don't tell me that you believe that any human can hear frequencies that high.
Sometimes there are services that don't have another option for online payment *other* than PayPal. It kind of sucks, but there it is. Just make sure you never keep any money in the account. PayPal's been pulling this kind of shit for years. I'm surprised no one has taken them to court over it yet (or if they had, why it hasn't made the news).
The city planners choose the location because the mountains made it a good defensible location in the middle ages. The town has been there for a long time.