Sorry Sherlock Holmes, after 13 years in science, I find hard to agree with your most famous quote:

“Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.”

Adapted to the lab, your pill of wisdom should read

“Once you eliminate the impossible, whatever remains, no matter how improbable, is that someone miscalculated a dilution, used the wrong reagent, forgot to split cells, or swapped samples.”