Ad: When Thinking Universe Realize It's Dark Out There Neck Tie
No need to be an astronomer or astrophysicist to enjoy wry geek humor with any of these gifts featuring the hypothesized percentages of dark energy and dark matter in the Universe. Comes with the tongue-in-cheek saying: "When Thinking About The Universe I Realize That It's Pretty Dark Out There". Word-play gifts on the concept of dark for all! myPhysics
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