Both the US and the UK issued silver "dollar" coins dated 1804.
The US ones weren't issued until 1834, and then sporadically in the 1850s. Originally they were made for presentation coin sets given to foreign dignitaries. Silver dollars hadn't been issued since 1804, but the ones issued back then were made with old dies and likely dated 1803. The later issues are likely the result of questionable dealings inside the mint of the time. Any real example is likely valued several hundred thousand USD or more. (https://www.coinworld.com/voices/gerald-tebben/u_s_mint_confiscate.html)
The UK ones were an emergency issue, considered a "token" issued by the Bank of England. They were made by taking widely available Spanish colonial 8-real coins and stamping a new design on to pass as 5 shillings (0.25 pound). These can be had for a couple hundred USD depending on condition. (http://www.coins-of-the-uk.co.uk/fives.html)
got one from back when I was learning C - wanted to be a game developer but it never panned out, anyway, the compiler I was using was a Borland product and in the comments of one of the .h or .c files, I forget which, there was a comment that was... actually I went and looked it up just now so I could get it verbatim. always thought it was interesting:
" 7 Hz is the resonant frequency of a chicken's skull cavity. This was determined empirically in Australia, where a new factory generating 7-Hz tones was located too close to a chicken ranch: When the factory started up, all the chickens died. Your PC may not be able to emit a 7-Hz tone "
I watched a YouTube video which discussed a similar issue with a pop song. I want to say it was something by Jennifer Lopez (?) which had a part that matched the resonant frequency of the hard drive in a certain laptop model and would cause the hard drive to crash.
edit: just looked it up, it was Janet Jackson's 'Rhythm Nation'
The FAA banned smoking on all domestic flights in 1990, but that did not stop some entrepreneurs. Twice in 1993 and in 2006, wealthy smoking enthusiasts tried to establish airlines to circumvent the rules using legal loopholes. Both of them, "Smokers Airways" & "SmintAir" (Smokers International Airlines) failed to raise enough capital to purchase an airplane and investors abandoned both projects.
You may have heard that you can survive a short while after falling below the event horizon of a supermassive black hole. If we extend general relativity further in, for rotating black holes there is an inner-horizon where escape velocity falls back below that of light.
As you approach this inner horizon though, all the matter and spacetime that has ever fallen in and will fall in gets compressed into a single moment at the surface. The dying star matter from its creation would be just in front of you, and everything that falls in in the future would rush up behind you. (Spaghettification would still kill you before getting that close though.)
Infalling matter also experiences an effect called 'mass inflation' where energies near the cauchy horizon approach that of the big bang. This also makes the horizon catastrophically unstable, but I haven't seen how this instability might resolve.
Also, depending on whether you are moving inwards or outwards as you cross the cauchy horizon, GR predicts you will end up in one of two disconnected inner-universes.
That is my favorite way I have ever heard anyone express that wish.
Some lint for you (accuracy may vary):
Bee family trees, if you follow a queen down through drones and workers and other queens, follow the fibonacci sequence. The fibonacci sequence is also reflected in the structure of spiral seashells. Source: Some book I read about the fibonacci sequence many years ago.
Flamingoes are motherfucking TANKS. Seriously. Their ability to survive in absurdly harsh environments that would kill other animals is wild.
Only female reindeer lose their antlers in wintertime (disclaimer: this may depend on species of reindeer?)
Some guy (Russian I think?), when a computer informed him that nuclear missiles had been fired at his country and he was told to return fire, correctly believed the computer to be bugged and refused to fire the missiles. So uh. Thanks, guy. He went and lived out his life normally and never got appropriate thanks for saving a shitload of people, I think. Source: memory of wikipedia article, may be wrong on some details so really I should be double checking those before repeating them but here you go I'm too tired for that.
Some other guy survived BOTH the Hiroshima and Nagasaki bombs, and lived to old age afterwards. Somehow both the literal worst luck, and the best.
There is a parasite that latches on to ants' feet that does not harm the ant - in fact, it fully replaces the function of the ant's foot, including forming a claw to help the ant grab stuff like it would with its actual foot. There is also a similar parasite that replaces a fish's tongue (yeah I hate it too).
Octpuses only live for like 3 years max, and the females die after laying their eggs. Meanwhile, they are really, really, really smart, like dolphins and parrots and crows. Imagine being that aware and smart, but only living 3 years. It disturbs me.
Uranium glass, which is exactly what it says on the tin - glass made with a teensy bit of uranium in it - glows in the dark in (typically) bright, cartoon acid green.
Whales can and do communicate across vast distances because their calls carry much more easily in water than sound carries in air.
Hammerhead sharks' heads detect electrical fields, and they use these fields to locate their prey. Run.
The whole alpha/beta/omega wolf pack thing is complete bullshit, retracted even by the person who first popularized it, and he has spent years upon years trying to scrub out that idea he unleashed into pop culture but has been unable to.
Elephants' feet are very sensitive, able to feel minute vibrations from miles away, and they can communicate with them. Also they do NOT make the thumping sound that is foley'd into nature documentaries - they walk silently. Also, the bottom of their feet looks like swiss cheese and you should not google that if you have tryptophobia.
Edit 2: most bees are solitary bees, and many look nothing like a honey or bumble bee. Many "save the bees" efforts end up counterproductive because they just boost domestic honeybees where the honeybees are an invasive species, and where some native plants are exclusively pollinated by a specific species of native solitary bee.
Adult wild cats do not meow except in the presence of humans. Even domesticated cats rarely do meow if no human is nearby. It seems cats figure out that we can't hear the frequencies they normally communicate with and purposefully make themselves heard.
About 360 million years ago, trees had evolved lignin and cellulose, allowing them to get big. However, no bacteria that could digest these woody substances had yet evolved. In fact, those bacteria would take another 60 million years to arrive. All this time huge trees kept growing, crashing into the swampy ground, and piling up on top of uncounted other trees, getting buried deeper and deeper into the ground. Over millions of years, subjected to the heat and pressure of deep burial, the carbon in these trees was converted into the fossil fuels we know and love today – coal, oil, and natural gas. All the fossil fuels we use were produced during this 60-million year period. Source
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