Limestone is a common type of sedimentary rock which I find uncommonly interesting! It's mostly calcium carbonate, which is also what eggshells π₯, seashells π, and pearls π¦ͺ are made out of.
In places where it rains a lot, limestone erodes easily, which results in simply gorgeous landscapes such as:
HαΊ‘ Long Bay in Vietnam
Tsingy de Bemaraha National Park in Madagascar
The Li River in China
Additionally, the world's longest (Mammoth) and deepest (~~Veryovkina~~ Krubera is once again the world's deepest cave, thank you to SockOlm for pointing that out) cave systems are both found in limestone formations
Mammoth Cave in the United States
Veryovkina Cave in Georgia/Abkhazia/Russia (disputed territory)
image sources
Thumbnail https://commons.m.wikimedia.org/wiki/File:ElTorcal0408.jpg#mw-jump-to-license
HαΊ‘ Long Bay https://commons.m.wikimedia.org/wiki/File:Halong_Bay_in_Vietnam.jpg#mw-jump-to-license
Tsingy de Bemaraha National Park https://commons.m.wikimedia.org/wiki/File:Tsingy_de_Bemaraha.jpg#mw-jump-to-license
Li River https://commons.m.wikimedia.org/wiki/File:Li-Flussfahrt-160-Huegel-2012-gje.jpg#mw-jump-to-license
Mammoth Cave https://commons.m.wikimedia.org/wiki/File:Mammoth_Cave_Rotunda_(USGS_Lwt02830).jpg#mw-jump-to-license
Veryovkina Cave https://commons.m.wikimedia.org/wiki/File:Veryovkina_cave._Babatunda_pit.jpg#mw-jump-to-license
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I just did after more than two years on prescription HRT and almost 3 years of presenting fem in public, partially because i want to be prepared if trans rights get rolled back in my country, partially because injections are extremely hard to get a prescription for around here and i'm tired of gel and partially because of an ideological commitment to being a gender outlaw. Also ngl there's just something exciting about sticking a needle in my leg and shooting up hormones. Obviously YMMV on this, i have friends who have a pronounced fear of needles and needed a ton of emotional support when they started injecting, but they still pulled it off.
I have a lot of friends who went from prescription to DIY for similar reasons, it actually seems more common in my circle than the other way around. I mean, most trans people i know have at some point DIYed for at least a few days when they couldn't refill a script on time and a friend helped them out with a bottle of gel or a few pills they had left over. I find it very rare that people who are actually part of an IRL trans community and transition hormonally never have some brush with DIY culture. It's almost unavoidable simply as a safety net.
I'm still unsure if i will tell my endo about it, i have no idea if she supports DIY, but so far i'm very happy with the results. I've been on HRT long enough to know what the range of my levels on gel + CPA looked like, gel can vary more than injections and i've been anywhere from 90 to 300 ug/ml on the same dose, interval and test time. So when i get new measurements in a month, it will be easy for me to compare. But i do want that as a control measure. Honestly wish i could DIY the blood testing as well.