Loved that part:
"Because the lava lamp wall is in the busy lobby of the Cloudflare headquarters, this happens all the time. People come and go in the lobby, walking by or stopping to talk in front of the lamps. Such obstructions become part of the randomness that the camera captures, so people partially blocking the camera's view of the lava lamps actually helps generate entropy."
We pronounce 'r' in Portuguese as 'h' in english words.
For example: the word 'mice' in Portuguese is 'rato' which we pronounce as if it was 'hato'. Similar to 'hat', 'hate' or 'hit'.
But never as the english word 'rat'. For us it sounds like 'rrrrrrrat', because the 'r' is too long in the pronunciation.
Summarizing: Portuguese don't use long 'r' phonemes when the word starts with 'r'. We usually pronounce as if the word starts with 'h' in english.
The long 'r' is used when 'r' or 'rr' appears in the middle of the words.