Biology experiments are notoriously sensitive: even fairly standard protocols can be wildly unreliable or unpredictable. I've heard of at least one instance whe

Biology experiments are notoriously sensitive: even fairly standard protocols can be wildly unreliable or unpredictable. I've heard of at least one instance where a lab worked out that for one protocol, the path they took when carrying the sample from one room to another mattered (one stairwell meant it didn't work, the other meant it did). Even in much simpler systems you get strange effects like disappearing polymorphs (https://en.wikipedia.org/wiki/Disappearing_polymorph https://en.wikipedia.org/wiki/Disappearing_polymorph)