Answer:
What I didn't understand is this question
Answer:
I believe that The word 'Validate' in this sentence would mean to clarify what the first one is saying.
Explanation:
If you get results from the first "experiment" then the second experiment's results will clarify, or prove what the first experiments answer was
Answer:
To me this old saying means that you don't get to redo your first impression to someone.
Explanation:
For example, if you are nice to someone the first time you meet them then they will know you are a generally nice person who is in a good mood. But, if you are rude, snobby, or tell someone off when you first meet them then they will think you are a bad person and won't want to be around you.