Hey kids, you need to start worrying a little less about getting “#mogged” and a little more about getting “#smogged”. This is an Air Quality Index public service announcement.
KIROKAZE

pixel skylines
Sade Olutola

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shark vs the universe

JVL
occasionally subtle
cherry valley forever

izzy's playlists!

oozey mess
The Bowery Presents
Monterey Bay Aquarium
Sweet Seals For You, Always
$LAYYYTER
trying on a metaphor

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Cosimo Galluzzi

Love Begins
sheepfilms
almost home

seen from United States
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@alyxtheoneandonly
Hey kids, you need to start worrying a little less about getting “#mogged” and a little more about getting “#smogged”. This is an Air Quality Index public service announcement.
A 50-kilogram anvil floats perfectly on the surface of mercury, because the density of the steel from which it is made is almost half the density of mercury.
damn that shit is light lmfao
Fun fact! Many lighthouses with especially large fresnel lenses would have huge fucking tubs of liquid mercury in the lantern room because it’s a super easy way to make these giant lenses rotate quickly!
Shockingly, however, spending most of your time in close proximity to 500 pounds of liquid mercury is Not Great For One’s Health and tons of lighthouse keepers started to go crazy from the whole. Mercury poisoning thing. Hence why there are a lot of “haunted” lighthouses or wickies that lose it and maybe do a bit of manslaughter.
Anyway, people saw a bunch of lighthouse keepers go crazy and get sick and got empirical evidence that it was in fact related to the 500 pound mercury bath they have to visit every day and then they decided nah it’s fine actually. So we’ve kept the liquid mercury thing and I think that’s beautiful
I love how it is so dense it does not "wet" the anvil, the drops all run and leave with nothing behind them unlike water, oil, sauce... it's super satisfying it's like in cartoons
In a letter written on April 19, 1825, Augustin Fresnel proposed the use of mercury to reduce the friction in revolving lenses. His statement follows: “I propose to float our rotating devices, of the first order, in a bath of mercury, instead of placing them on rollers. This project won't present many difficulties; nevertheless, as I have not put it into execution, I won't require you to adopt it for your first lighthouse.”
Fresnel’s plan for mercury flotation was not put into practice until 1890 when Monsieur Leon Bourdelles, Chief Engineer of the French Lighthouse Service, designed and built a workable mercury flotation system. The mercury bath allowed the lens to operate in an almost frictionless environment and, additionally, allowed the speed of rotation to be dramatically increased.
Lens Rotation by Thomas Tag | United States Lighthouse Society
Ah to be a sailor in 1890 who has to turn to his fellow men and ask "is it just me or are the lighthouses flashing faster?"
They had been slowly getting faster for decades.
It mattered for optics reasons.
Under less-than-ideal conditions, you can only see the beam when it’s pointed more or less directly at you. In-between beams you would not be able to see anything. One solution to this was to create multiple beams, and the lenses Mr Fresnel designed usually created 8 beams. But, even still, duration between flashes could be as long as one minute in the old mechanical roller systems.
The nearly frictionless operation of the Mercury suspension system allowed the lenses (large pieces of precisely ground glass weighing several hundred pounds in some cases) to rotate fast enough that they could be redesigned to create fewer (usually 3) beams. Fewer beams from a similar light source will be proportionally brighter, and the gains in speed were sufficient that duration between flashes could still be reduced to as little as 10 seconds.
This was a big upgrade. It didn’t just make the lighthouse signal faster, it allowed them to completely overhaul the lens and derive more visibility from a light source.
What’s a little Madness, in the face of Progress?
mods are asleep, post the fresnel lens
Bumble sharks 🐝🦈
henceforth this is the only weapon you need to bring to the ai war
loudly going "YOU'RE GOOD YOU'RE GOOD" to myself to ward off the memory of every embarrassing thing i've ever done
I actually learned a fun therapy trick for this!
The statute of limitations on arson is 6 years.
So whenever I remember an embarrassing or shameful thing I’ve done, I ask myself if it was worse than arson. If it wasn’t, and it was 6 or more years ago, I forgive myself.
Also just the comedic shock of going “well, that was a stupid and mean thing I said, but 6 years is the statute of limitations on arson” helps.
One of the best letters I’ve ever seen just popped up on my Facebook memories. Still makes me laugh.
As today is the 50th anniversary of the moon landing, it’s a great time to revisit Dinah from Devon’s memory of this historic event. And yes, still makes me laugh.
Today is the 54th anniversary of the moon landing, but Dinah’s diary entry is still absolutely magnificent.
57th anniversary of the moon landing and the best diary entry in the history of diary entries. Sit down Samuel Pepys, it’s over. UGH.
very safes actually no need to worry or stress
Snoopy button, 1969
I need my weird alone time or I will explode
Absolutely wild to me how sometimes you don't even realize the way you'd been taught to perceive things as a kid was kinda fucked up, actually, until decades later.
Example:
As a kid, I constantly lived in fear of damaging shit in my parent's house. The walls. The floors (especially the floors. The wood was beautiful. Shiny. But so easy to scratch). The cabinets.
As a sixteen-year-old, I once took my car to the dealership after work and paid a very dear sum of $250 ($10/hr cashier salary) to fix a slight scratch in the paint because I knew if my father saw it there would be hell to pay. It didn't matter that I parked far out, like I'd been taught, and someone scratched it anyway. It was my fault. I failed in my duties as a steward of my vehicle.
Every time I scratched a rim on a curb while parallel parking or got a door ding or, god forbid, didn't wash and vacuum that car every weekend, it was treated like some sort of moral failing.
Last year, when my husband and I first moved into our house, he scraped the side of our car when parking in our (Very Narrow) garage. When he told me, my first instinct was to be afraid for him. Like something terrible was going to happen to him because of this mistake. I urgently reassured him that it was okay, it was an accident, I wasn't mad. Baffled, he was like, "Yeah? I know? Like, thank you for the reassurance, but I'm only a little annoyed, I'm not upset. It's just a car." And I had to take several minutes to process that. It's...just a car.
We keep the car tidy. We maintain it. But we wash it maybe 4x a year. We only vacuum it after dirty road trips or when the dog hair starts to get annoying. It has scrapes and dings and the leather seats have stains. But that's ok. Because it's just a car.
This morning, I realized that a small rock had gotten embedded in the felt foot on one of our bar stools. Neither of us had noticed. There are now scratches on our beautiful hardwood floor. My immediate response was fear accompanied by a heavy measure of paralyzing guilt. "I'm so sorry," I told my husband, "I should have noticed. I'll figure out how to fix it, I swear. I can probably sand down that section and match the stain and--"
"Whoa, hey," he said. "It was an accident. And it's fine. Floors are going to get damaged. They're floors. We live here. There was damage in places before we even bought the house, remember? It's not a big deal. It's just a floor." Right. It's just a floor. Right.
My husband's mom is visiting and this afternoon, as I was sitting in the kitchen looking at the scratches on the floor, I offhandedly asked her if my husband had ever broken or damaged anything as a kid. "Of course," she said. Household items. A TV. A wrecked car during his teen years. I asked how she punished him.
"Why would I punish him for things like that?" she said. "They were all accidents."
Right. Of course. Right.
moon's haunted
5 0 Y E A R S A G O
Almost 57 years ago!
local matchmaker losing it over yet another unrealistic demand from the clientele 🤣🤣
Translation by me. :))
“Even a slightly increased possibility of summoning rain is still an ability to summon rain” is such a good point
Me at least twice a week
i love learning about animals ive literally never seen or heard of before. what amazing diversity of life on this planet earth. what the hell is a japanese serow
goat dog