Interestingly, in Southern Ontario, you do use "the": the 403, the 401, etc.

On the other side of the country, in southwest BC, we have fewer notable highways. The big one is "Number 1", or "the Trans-Canada", and in my town would just be called 'the highway' :). Checking with my parents, others are referred to by number without 'the', or by name with 'the'.

...while the Sun, through proton-proton fusion, emits neutrinos. If solar neutrinos do affect radioactive decay, maybe it's because of the difference between neutrinos and antineutrinos?

In Canada here, in my experience, at the pub beer comes as pints (22 UK fl. oz.), half-pints (12 UK fl. oz. -- yes, it's not really one half of a pint), sometimes as "schooners" (16 UK fl. oz.)*, and various bottles (341 ml, 500 ml) and cans (not sure, 355 ml?, plus some bigger ones).

* I've only seen this in BC, and it's rare enough that I'm not sure about it.

90% is available in front of the pharmacy counter here in Canada. Great stuff for cleaning dry-erase boards.