I recently learned to whistle as well! (in my late 30s). I'm bad at it, but finally can make a recognizable tune.
More recently though I've learned to cut my own hair :)
I don't remember all of the details, but I thought it was essentially the water's surface tension that foots the energy bill when climbing a paper towel or a capillary in a tree.
The surface of fluids like water are unhappy. Molecules on the surface would much rather be deep in the fluid because on the surface they have "dangling" Van der Waals & polar bonds to one side. You can calculate the potential energy of the surface due to all of those dangling weak bonds, & that's the energy that is used to climb a capillary (the energy isn't free).
I could be misremembering though, I admit. School was many years ago...
In ye old'n times we would leave the console on as a stop-gap way to save the game between in-game save opportunities. Because ye old'n times game design philosophy believed that the added difficulty of crazily separated save points was "fun".
In modern times I sleep the hardware if I expect to be back within <24 hrs, and power off if I expect to be longer.
(Thank god for saving memory states in emulators!!! Elsewise I probably wouldn't play retro games at all.)
Joplin is FOSS & supports live LaTeX. The editor is markdown & you use
$
for inline LaTeX &$$
for full line.They've got both desktop & mobile versions. One of my favorite apps.