There's an old quote from Arthur C. Clarke that I think is relevant here: "When a distinguished but elderly scientist states that something is possible, he is

There's an old quote from Arthur C. Clarke that I think is relevant here: "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong." (Apologies to moxie for the whole "elderly" bit!)