However, since this is a technical article with a fair amount of math, I feel compelled to be pedantic and point out a math/language problem in the article.
The article says,
"For every 10 meters of depth, the pressure increases by 1 bar, or 14.5 psi. That means that on a dive 20 meters (around 60 feet) below sea level, there would be a water pressure of 43.5 psi, three times greater than the air pressure at Earth’s surface."
While the numerical statement is true - at 20 meters, the water pressure would be 43.5 psi, this not "three times greater" than the air pressure at the Earth's surface (14.5 psi). Rather, it is "three times as much". "Three times greater than" would be 49 psi.
I know that this is common usage, seen often in TV commercials, "...new - now 3 times bigger than before...", but I don't expect to see it in a technical article.
But I tend to create a file per week, with notes about what I have to do / have done, etc. by day within the weekly file.
Having one big file for a project that lasts months (or years) would be unworkable.
I'd like to see the ability to create and open whatever files I want, rather than just saving a single pre-determined file.
Good job, though - thanks!