In the Einstein Biography by Walter Isaacson he mentions that Einstein didn't have a learning disability but somehow held on to his childlike quality Do you believe this is true or possible?

Answer 1

I have not read this biography, so am not sure of the context, but I suspect you are taking the term "childlike" more literally than the author intended it. I'd assume the author meant that Einstein was idealistic and/or kept a sense of wonder that many people lose after childhood, rather than that his mind was undeveloped.

I don't think it is possible for an adult to truly have the mind of a child, unless of course he is mentally impaired in some way-- which Einstein self-evidently wasn't. (Yes, I am aware that like many other famous dead people, he has been "claimed", so to speak, by various groups of people with mental handicaps-- but that is clearly just the result of wishful thinking.)

To sum up: whether I believe it possible depends on the sense in which you mean "childlike".