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In the spirit of Halloween, I felt inclined to revisit something a little bit spooky—little glow-in-the-dark stars in petri dishes. To the average human, it is apparent that these little “stars” only seem to be glowing in the top petri dish and not the bottom. Was this a mistake? Wouldn’t it be cooler if the stars in the other dish were glowing as well? Turns out the stars are actually Escherichia coli bacteria—one genetically modified to glow just like jellyfish do. Yeah, yo