Reading

Repair Video

https://xkcd.com/3163/

The statue should be in the likeness of whatever sculptor posted the sculpting tool repair video that was most helpful during the installation of the statue.

https://xkcd.com/3163/

Heart Mountain

https://xkcd.com/3162/

Even geology papers about Heart Mountain are like, "Look, we all agree this 'volcanic gas earthquake hovercraft' thing seems like it can't possibly be right, but..."

https://xkcd.com/3162/

Airspeed

https://xkcd.com/3161/

Carefully maneuvering the balloon down a mineshaft in an effort to break the OTHER altitude record

https://xkcd.com/3161/

Document Forgery

https://xkcd.com/3160/

It comes with a certificate of authenticity, which comes with a certificate of authenticity, which comes with a...

https://xkcd.com/3160/

Continents

https://xkcd.com/3159/

The inflection point was probably in late 1966 or 1967, so when Neil Armstrong flew to space on Gemini 8, plate tectonics was not widely accepted, but when he landed on the Moon three years later it was the mainstream consensus.

https://xkcd.com/3159/

Shielding Chart

https://xkcd.com/3158/

Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high.

https://xkcd.com/3158/