Crow and Raven

Marya was wondering some years ago how to tell the difference between a crow and a raven when they aren't side by side, where one is obviously bigger than the other.

Click image to enlarge; from Saskatchewan Birds.

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During the night I woke up and put the radio on and heard someone talking about using progressive (?) meditations to deal with health conditions.
Or that's what I think I heard.
While searching the CBC website to find it, this came across my path:

http://www.cbc.ca/radio/dnto/what-makes-you-happy-1.3402687/want-to-boost-your-mood-talk-to-a-stranger-1.3406575

Out here everyone talks to everyone, strangers or no.