#xkcd 2940

[todays-xkcd]

My bold criticism might anger the hot air balloon people, which would be a real concern if any of them lived along a very narrow line directly upwind of me.

Modes of Transportation [Explained]

Transcript Under the Cut

[A chart is shown, where the Y axis is labeled "Convenient for travel" and has an arrow pointing up and the X axis is labeled "Dangerous" and has an arrow pointing right.]

[In the "Zone of practicality" (top left area of the chart):] Trains Airliners Cars Scooters Bicycles Boats Walking

[In the "Zone of specialty and recreational vehicles" (from the top right to the bottom left):] Motorcycles Helicopters Light aircraft Go karts Skateboards Rollerblades Skis Unicycles Sleds Bumper cars

[Labeled "?????" (in the bottom right corner):] Hot air balloons

[Caption below the panel:] Hot air balloons are the optimal mode of transportation, if your optimization algorithm has a sign error.