Fools rush in where fools have been before. Inside every small problem is a large problem struggling to get out. No experiment is reproducible. Whenever a system becomes completely defined, some damn fool discovers something which either abolishes the system or expands it beyond recognition. Spend sufficient time confirming the need and the need will disappear.
People are always available for work in the past tense.
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. A man with a watch knows what time it is. A man with two watches is never sure. Nothing is impossible for the man who does not have to do it himself.