Reading

Mantle Model

https://xkcd.com/3141/

Mantle plumes explain Hawaii, Yellowstone, Iceland, the East African Rift, the Adirondack uplift, the Permian extinction, the decline of Rome, the DB Cooper hijacking, and the balrog in Moria. Those little hills of sand in your yard are caused by antle plumes.

https://xkcd.com/3141/

Biology Department

https://xkcd.com/3140/

Welcome to the Linguistics Department - It has been [2] [DAYS] since someone noticed that the Biology Department sign has a one-day-long singular/plural disagreement after it resets.

https://xkcd.com/3140/

Chess Variant

https://xkcd.com/3139/

The draw-by-repetition rule does a good job of keeping players from sliding a tile back and forth repeatedly, but the tiles definitely introduce some weird en passant and castling edge cases.

https://xkcd.com/3139/

Dimensional Lumber Tape Measure

https://xkcd.com/3138/

A person with two watches is never sure what time it is, especially if I got them one of the watches.

https://xkcd.com/3138/

Cursed Number

https://xkcd.com/3137/

Another group of mathematicians is working to put an upper bound on the number, although everyone keeps begging them to stop.

https://xkcd.com/3137/

Pull

https://xkcd.com/3136/

Be careful fighting gravity. If you win, it's a long way down.

https://xkcd.com/3136/