Case in point, the woman who can smell Parkinson's disease, to some ridunculous p-value.
http://www.scientificamerican.com/article/one-woman-s-abilit...
Some effects published in medical journals have a less convincing p-value.
A decent dev machine for $2K-ish, save for a major flaw: "coil whine"[1]. Very annoying when working in silent environments. Frustratingly random as well - for me, backlight on/off, usb connect/disconnect and scrolling on browsers would change the whine frequency noticably. [2]
It is possible that you can hear something similar from your MBP - however it is very unlikely that this has anything to do with any of the radios.
I miss the good old days when you knew your PC was busy by the HD sounding like a thousand monkeys tap-dancing shakespear.
[1] https://en.wikipedia.org/wiki/Coil_noise
[2] BTW, Dell denies this issue, claiming it was fixed before 9333. Users disagree: https://www.reddit.com/r/Dell/comments/47g46m/lets_investiga...
Is this true? What about heat radiation for example. We can feel that.
And we can see/sense changes in electromagnetic fields: http://www.nature.com/ncomms/journal/v2/n6/full/ncomms1364.h...
However, this would be pretty easy to test! Just have a friend call you at random times throughout a 2-hour interval or something, and record every time you think the phone is about to ring, and every time it actually does. If there's a close enough correlation between the two, that's fairly persuasive evidence.