Ad: Present Is A Relative Concept Light Cone Physics Face Mask
Do you often wonder where you are on the time-space continuum? Wonder no further with this physics geek humor cotton/polyester face mask featuring exactly where an observer is in the present between the future light cone and past light cone. Make others do a double-take with this educational scientific truism saying cotton/polyester face mask which notes that "Present Is A Relative Concept"! myPhysics
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