XKCD/3159: Continents 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)

XKCD/3158: Shielding Chart Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high. (https://xkcd.com/3158)

XKCD/3157: Emperor Palpatine Many things about Star Wars were not well planned out, but having a 37-year-old in old-age makeup play the Emperor in Return of the Jedi was such an incredible call. (https://xkcd.com/3157)

XKCD/3156: Planetary Rings If you don't know where you are on Earth, the angle of satellite dishes can help constrain your latitude. If some of them are pointing straight up, you're probably near the Equator, right under the ring. (https://xkcd.com/3156)

XKCD/3155: Physics Paths If nothing else, that reasoning definitely overturns syllogisms. (https://xkcd.com/3155)

XKCD/3154: Physics Insight When Galileo dropped two weights from the Leaning Tower of Pisa, they put him in the history books. But when I do it, I get 'detained by security' for 'injuring several tourists.' (https://xkcd.com/3154)

XKCD/3153: Hot Water Balloon Despite a reputation for safety, the temperatures and surprisingly high pressures make them even more dangerous than the air kind, but the NTSB refuses to investigate accidents because they insist there is no 'transportation' involved. (https://xkcd.com/3153)

XKCD/3152: Skateboard I understand it's hard to do more than 300 feet on these 90-second rush jobs, but with a smaller ramp I'm worried the gee forces will be too high for me to do any tricks. (https://xkcd.com/3152)

XKCD/3151: Window Screen The Nobel Prize in Physiology or Medicine or Home Improvement or DIY (https://xkcd.com/3151)

XKCD/3150: Ping Progress on getting shipwrecked sailors to adopt ICMPv6 has been slow. (https://xkcd.com/3150)