Considering mining as a ‘process in which events occur continuously and independently at a constant average rate,’ I found this article https://en.wikipedia.org/wiki/Exponential_distribution and used it as a reference.  It gave me ready to use formulas for the probability distribution that describes the time between events in such a process.  The cumulative distribution function 1 - e^-λx is the probability of encountering an interval shorter than x, where

• λ = 1/β is the rate, and
• β = 10 minutes, i.e. the mean time between events.

The likelihood of an interval longer than x is then e^-x/β.  For instance, intervals longer than 5 times the mean time happen with the probability of e^-5.

There is no sigma in an exponential probability distribution, which is the distribution of time intervals between events in a Poisson process.

In theory, the probability of an inter-block interval exceeding 50 minutes is about 0.0067, or one out of 148.

When bitcoin drops below $10, will the community have to move together to kilobits then?

Some text editors (notably, Notepad under Windows, but I guess Linux might have that kind of thing too) insert BOM characters into text files to indicate that the content is in unicode, type of unicode encoding, byte order etc.

I imagine it can be entirely possible that it was not QtQR who inserted that BOM (zero-width space).

I wouldn't include a fix for that.  What if next thing someone types a URI in MS Word?

I recently discovered the benefits of barbed wire.  Because of that I had to move to another house, which is surrounded by a barbed wire fence.

I mean, did you think about what these benefits would actually give you and whether they would apply in your case?  Sure, using an HD wallet means one doesn't have to think and worry about possible loss of privacy due to address reuse, or face the inconvenience of maintaining tons of non-HD keys.   And all the hard work that wallet developers put into delivering BIP32 to their users is truly commendable.  But all too often people read flashy headlines like "address reuse considered harmful" or "USB is fundamentally broken" and rush into action.