Humanologist here. This is actually a common confusion, you also have to take into account the colour of the hair on their head to differentiate them. To help, you can recite:
black on white, go and bite
yellow on white, go and bite
black on black, bite and whack
Mmmh now that I think of it, the identification stage might not be that useful
I thought it was "let's invade Europe with our glorious hordes! Our empire will stretch from the steppes to the ocean!" but my Hungarian is a bit rusty
In my (personal) experience, mathematicians have absolutely no difficulty to let their colleagues know when they don't understand a concept. It seems quite normal to reach your max level of abstraction in the field.
In physics, it can be seen as a weakness sometimes. And some people will pretend they always understand everything.
While Nim was in New York, Terrace believed he was learning sign language. But in reviewing the data, Terrace came to a conclusion that surprised almost everyone involved: Nim, he said, was not using language at all. Terrace said that he changed his mind when watching videotapes of Nim (in his classroom). Language requires the use of sentences, and Nim didn't use sentences. Though Nim recognized and used signs, Terrace said he did not initiate conversation. When Nim combined signs, they tended to be highly repetitive and filled with "wild cards"—words like ME, HUG, NIM, and MORE. For example, Nim's longest utterance, 16 signs, was: "Give orange me give eat orange me eat orange give me eat orange give me you." The videotapes, Terrace argued, proved that Nim mimicked his teachers and used signs strictly to get a reward, not unlike a dog or horse.
What is your gun for? Shoot the girl already, she's clearly up to various mischievous shenanigans