it is, but mainly because 'meinen' also means: think\mean (according to Google) and most most of us don't know it.
Can "meinen" mean "to mean" as well? As in "What do you mean?" "Was meinst du?" "I mean that..." "Ich meine dass..."
Meinen as a verb is hard to wrap my head around. Ich meine...! Is this common to use? As common as ich denke?
I don't think that's true. Both are fine. Anyway, it'd have to be "meiner Meinung nach".
Words like this (meinen) make me feel at times that the "creators" of the German language forgot the other letters of their alphabet. Couldn't they have come up with "teinen" or "peinen" for "to think", instead of the heavily declined "mein"?
Up until now I though mein/meinen translated to "my". does it also mean "mean"?
I wrote 'What think the experts?" same meaning.. different order - think its still okay. But the correct answer is shown now as 'What do the experts mean?' Is that right? where is the word 'mean' implied?
"What think the experts?" isn't proper (modern) English. You should use "What do the experts think?" instead.
Duolingo suggests "What do the experts mean?" because the verb "meinen" can be translated as either "to think" or "to mean". Either way, this question is asking the listener to paraphrase or summarize the essence of what the experts have said about the (unspecified) topic.
I wish DL would annotate confusing stuff like this, especially when it is first introduced through a spoken exercise.