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A discussion of why English speakers in various countries pronounce ‘sh’ at the start of words like ‘street’ and ‘strong’.
MRI videos from University of Glasgow:
https://www.seeingspeech.arts.gla.ac….
Josh at English Hacks on ‘tr’ and ‘dr’:
Keenyn Rhodes on ‘storm chroopr’:
Picture credit:
Hank Green (thumbnail) Creative Commons Attribution 3.0 Unported license
https://commons.wikimedia.org/wiki/Fi…
msamba 
Interesting, I always thought these pronunciations were wrong in English.
In German, st is always = sht, except in words deriving from Latin. Only in the north they pronounce it st, and that sounds funny to us.
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