Another old article by Douglas Adams, which (if we apply a few find-and-replace) is still up-to-date...

Just replace "power adapter" with "USB dongle", or for a different take "voltage" with "USB-A (micro, mini, normal) / USB-C / lightning / HDMI / DVI / DisplayPort (mini and normal) / ThunderBolt" and you can have a good laugh at our own expense...