That happened to me once during a school demo on the phases of meiosis — we mixed up disposable staining trays with reused ones, and it messed up the results. We now use simple drawer dividers with big, bold labels, and keep sterile items in sealed plastic boxes. Also, getting rid of duplicate storage spots helps a lot. One place for one thing — no exceptions.
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Saw this while browsing for a thermal cycler review — honestly, these little mix-ups sound small until you realize how big the consequences could be. Definitely bookmarking this thread.