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The latest xkcd comics. (xkcd.com)

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'I'm trying to buy a gravitational lens for my camera, but I can't tell if the manufacturers are listing comoving focal length or proper focal length.'

3182. "Telescope Types"

'Earth's r_jf is approximately 1.5 light-days, leading to general relativity's successful prediction that all the frogs in the Solar System should be found collected on the surface of the Earth.'

3181. "Jumping Frog Radius"

'The experimental math department's budget is under scrutiny for how much they've been spending on trains leaving Chicago at 9:00pm traveling at 45 mph.'

3180. "Apples"

''That's definitely above the catch-and-release size minimum for planetesimals.' 'I'm going to throw it back anyway.''

3179. "Fishing"

'Our models fall apart where the three theories overlap; we're unable to predict what happens when a nanometer-sized squirrel eats a grapefruit with the mass of the sun.'

3178. "Hyperacute Interdynamics"

'Luckily, the range is limited by the fact that the square boundary lines follow great circles.'

3177. "Chessboard Alignment"

'Some tires are marketed as 'all-shape tires,' but if driven in a climate with both inverted catenary falls and triangle falls, they wear out really fast.'

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