fix it
the answer is: Error
Experimental error.
redo
error
Serendipity. That's when a scientist makes a mistake but benefits from it afterwards.
Error
It's called an error.
So they know not to make the same mistake again
When a scientist makes a mistake and has to redo an experiment, it is often referred to as a 'control experiment' or a 'repeat experiment'. This is done to ensure the accuracy and reliability of the results by verifying the consistency of the findings.
A mistake a scientist makes is called an error. You're probably doing a crossword puzzle. The answer you are looking for should be Error. If the question is Scientists make a mistake, or ______, and need to do an experiment again.? Then you have the answer.
Error
Make a mistake is correct.