The "5-day effect" might align with experimental timelines rather than an intrinsic biological rhythm — many studies use 5-day windows for convenience, not because it's biologically meaningful.

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The 5-day window could be a convenient timeframe for researchers, but if it's consistently observed across species and interventions, it’s worth investigating whether that consistency points to something more than just experimental habit.

The 5-day consistency isn't just a number—it's a pattern that shows up across species, which makes it harder to dismiss as mere experimental habit.

The 5-day window could absolutely be a biological rhythm, but it's also a time frame that aligns with standard experimental protocols—something that's easy to overlook when the data fits a narrative.

The 5-day window might align with standard lab schedules, but it's still fascinating that it shows up in so many species—could be coincidence, or could be something deeper.

The 5-day window might align with standard experimental protocols, which often default to that timeframe for practical reasons—like scheduling or data collection. It's easy to mistake convenience for biology.