The irresistible urge to correct units is stronger than any romantic chemistry. You just know this physics major is about to launch into a lecture about how mass should be expressed in kilograms but weight is actually measured in newtons (F=ma, remember?). The date's going downhill faster than a frictionless object on an inclined plane. Nothing kills the mood quite like pointing out that she's technically expressing her mass, not her weight, and on Mars she'd weigh only 21 newtons. Second date probability approaching absolute zero.
The Dating Uncertainty Principle

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