26 July 2024

An outstanding "Rube Goldberg" apparatus

"This outdoor Rube Goldberg Machine goes around my entire yard, and swishes a basketball shot after 70 steps. This video was filmed in one take, meaning there are absolutely no hidden cuts or edits. The machine took a month to build and another month to successfully work, so please share this with anyone who needs some entertainment during these strange times!  Filmed entirely with the GoPro MAX. The GoPro MAX is a 360 camera, and I used it for this video so I did not have to stress about missing anything during the filming process. With the GoPro MAX, you can reframe your video after you film it, so it was impossible to miss any part of the machine when filming. If there are any strange spots in this video you might think looks like a cut or edit, that is just the stitching of the 360 video."

The Wikipedia explanation of Rube Goldberg machines

See also Unconventional dinner - updated (2020)

Ideal "launch angle" for hitting home runs


In theory an object travels the longest horizontal distance when it is launched at a 45 degree angle.  But very few home runs come off the bat at a 45 degree angle (most such launches would result in a "pop-up."

There are multiple contributing factors (several discussed here), but the simplest to understand was provided in an ELI5 post:
It’s mainly because the air resistance increases in proportion to the square of the velocity. So if something is going twice as fast, it has 4x the air resistance.

The ball leaves the bat going very fast (up to 121 mph), so at the beginning of its flight it slows down quickly because the air resistance is much higher. If we want the ball to go far, it needs to cover more horizontal distance while it’s going fast, so it’s better for it to be moving at an angle shallower than 45 degrees during that time. If it leaves at a 45 degree angle, the horizontal velocity is lost more quickly (edit: more quickly in terms of how far the ball has moved horizontally over a period of time)

Addendum:  FWIW, I would have some doubts about the regression line in the graph.  I'm surprised the r^2 is that small given the scatter, but perhaps some dots represent multiple events. Anyway, the explanation is still valid.

25 July 2024

Seeking advice on "Orphan Black"


I've just finished watching season 1 of the 2013 Orphan Black "sci-fi thriller" series, and I enjoyed it.  The concept was somewhat novel, but mostly I was impressed by the multiple-award-winning acting skills of Tatiana Maslany, who portrays six (?) clones and imparts to each one a separate character.

My question for the group is whether I should dive into four more seasons of episodes.  My experience with other long-running series is that they tend to become derivative and predictable.  Mad Men was best in its first couple seasons IMHO; same for House of Cards and Westworld.

I'll start season 2 when the DVDs arrive from the library.  Will I be disappointed?

24 July 2024

Mt. Etna blowing smoke rings

"To the surprise of some, Mt. Etna emits, on occasion, smoke rings. Technically known as vortex rings, the walls of the volcano slightly slow the outside of emitted smoke puffs, causing the inside gas to move faster. A circle of low pressure develops so that the emitted puff of volcanic gas and ash loops around in a ring, a familiar geometric structure that can be surprisingly stable as it rises. Smoke rings are quite rare and need a coincidence of the right geometry of the vent, the right speed of ejected smoke, and the relative calmness of the outside atmosphere."
Fourteen years ago I noted the creation of a smoke ring by the Eyjafjallajokull volcano in Iceland. Exploding transformers on power poles can create the same effect.

J-turn ("Michigan left") explained

The intersections limit points where vehicles could collide by forcing drivers on side roads to turn right, go a short distance down the road, make a U-turn through the median, then loop back to the intersection to continue their trip...

Minnesota's first J-Turn intersection was built in 2009, and now more than 60 exist statewide (2022) with more planned. They have been credited with significantly reducing right-angle crashes resulting in serious injuries and deaths...

Despite J-Turns' safety benefits — data showed they cut fatal and serious injury crashes at intersections by 69% — it's been tough to convince the public, said MnDOT traffic engineer Derek Leuer.

"They have never seen one," he said.

And when they do encounter the intersections, drivers are not fond of them.
The Wikipedia entry provides some discussion.

Addendum:  A reader offered this screencap from Google Maps of a J-turn setup with no option for straight-across crossing of the divided highway.  Basically, this creates a elongated roundabout -


- but maintains higher speeds on Highway 1, where a true suburban roundabout would potentially bring main highway traffic to a stop at busy hours.  Interesting.

"When I am an old woman..."

"When I am an old woman I shall wear purple 
With a red hat which doesn’t go, and doesn’t suit me. 
And I shall spend my pension on brandy and summer gloves 
And satin sandals, and say we’ve no money for butter. 
I shall sit down on the pavement when I’m tired 
And gobble up samples in shops and press alarm bells 
And run my stick along the public railings 
And make up for the sobriety of my youth. 
I shall go out in my slippers in the rain 
And pick flowers in other people’s gardens 
And learn to spit. 

You can wear terrible shirts and grow more fat 
And eat three pounds of sausages at a go 
Or only bread and pickle for a week 
And hoard pens and pencils and beermats and things in boxes. 

But now we must have clothes that keep us dry 
And pay our rent and not swear in the street 
And set a good example for the children. 
We must have friends to dinner and read the papers. 

But maybe I ought to practise a little now? 
So people who know me are not too shocked and surprised 
When suddenly I am old, and start to wear purple."
Reproduced in toto from the Scottish Poetry Library, "Warning" is a 1961 poem by Jenny Joseph that has become a long-time favorite of the reading public and an inspiration for the Red Hat Society.

Lifelike talking faces


Explained at a Microsoft website:
We introduce VASA, a framework for generating lifelike talking faces of virtual characters with appealing visual affective skills (VAS), given a single static image and a speech audio clip. Our premiere model, VASA-1, is capable of not only producing lip movements that are exquisitely synchronized with the audio, but also capturing a large spectrum of facial nuances and natural head motions that contribute to the perception of authenticity and liveliness. The core innovations include a holistic facial dynamics and head movement generation model that works in a face latent space, and the development of such an expressive and disentangled face latent space using videos. Through extensive experiments including evaluation on a set of new metrics, we show that our method significantly outperforms previous methods along various dimensions comprehensively. Our method not only delivers high video quality with realistic facial and head dynamics but also supports the online generation of 512x512 videos at up to 40 FPS with negligible starting latency. It paves the way for real-time engagements with lifelike avatars that emulate human conversational behaviors.
Lots of video explanations at the site, followed by this disclaimer:
Our research focuses on generating visual affective skills for virtual AI avatars, aiming for positive applications. It is not intended to create content that is used to mislead or deceive. However, like other related content generation techniques, it could still potentially be misused for impersonating humans. We are opposed to any behavior to create misleading or harmful contents of real persons, and are interested in applying our technique for advancing forgery detection. Currently, the videos generated by this method still contain identifiable artifacts, and the numerical analysis shows that there's still a gap to achieve the authenticity of real videos.

Saddle up!


17 July 2024

Annie Dillard redux


After reading Pilgrim at Tinker Creek, I decided to give Annie Dillard's other writing a try.  When Holy the Firm was published in 1977, some readers wondered if she had been taking hallucinogenic drugs while writing the book (she indicated that she had not).  I can see why those questions arose, and I''m not going to award this book inclusion in the recommended books subcategory of this blog, but I will share several favorite passages and a few words:
"It is the best joke there is, that we are here, and fools - that we are sown into time like so much corn, that we are souls sprinkled at random like salt into time and dissolved here, spread into matter, connected by cells right own to your feet, and those feet likely to fell us over a tree root or jam us on a stone.  The joke part is that we forget it.  Give the mind two seconds alone and it thinks it's Pythagoras.  We wake up a hundred times a day and laugh.

The joke of the world is less like a banana peel than a rake, the old rake in the grass, the one you step on, foot to forehead.  It all comes together.  In a twinkling.  You have to admire the gag for its symmetry, accomplishing all with one right angle, the same right angle which accomplishes all philosophy.  One step on the rake and it's mind under matter once again.  You wake up with a piece of tree in your skull.  You wake up with fruit on your hands.  You wake up in a clearing and see yourself, ashamed.  You see your own face and it's seven years old and there's no knowing why, or where you've been since.  We're tossed broadcast into time like so much grass, some ravening god's sweet hay.  You wake up and a plane falls out of the sky."     [the last sentence being a real-life event that triggered the writing of this book]

"When the candle is burning, who looks at the wick?  When the candle is out, who needs it?"

"Did Christ descend once and for all to no purpose, in a kind of divine and kenotic suicide, or ascend once and for all, pulling his cross up after him like a rope ladder home?"   When I saw "kenotic" I presumed it was related to "keynote/importance".  But the word is the adjectival form of kenosis, the Greek term referring to "the relinquishment of divine attributes by Jesus Christ in becoming human."  Totally new word for me (Dillard was raised Catholic and later became "spiritually promiscuous.")

"By what freak chance does the skin of illusion ever split, and reveal to us the real, which seems to know us by name, and by what freak chance and why did the capacity to prehend it evolve?"  To lay hold of, to seize.  Related to prehensile and presumably to comprehend.

"It is morning: morning! and the water clobbered with light."  Pounded mercilessly.

"The more accessible and universal view, held by Eckhart and by many peoples in various forms, is scarcely different from pantheism: that the world is immanation, that God is in the thing, and eternally present here, if nowhere else."  Apparently "a flowing or entering in."  But I think she is using (or creating) the noun form of the adjective immanent ("naturally existing as part of something").

"You might as well be a nun.  You might as well be God's chaste bride... Look how he loves you!  Are you bandaged now, or loose in a sterilized room?...  Learn Latin, an it please my Lord, learn the foolish downward look called Custody of the Eyes."

15 July 2024

Excerpts from "Pilgrim at Tinker Creek"


I recently enjoyed rereading Edwin Way Teale's A Naturalist Buys an Old Farm, about 40 years after having first encountered it.  Reviews of that book compared it to this one, so now I've had my first encounter with Annie Dillard.  Herewith some excerpts from her Pulitzer Prize-winning book:
"James Houston describes two young Eskimo girls sitting cross-legged on the ground, mouth on mouth, blowing by turns each other's throat cords, making a low, unearthly music." (p. 26)

"Ladybugs hibernate under shelter in huge orange clusters sometimes the size of basketballs.  Out west, people hunt for these... they take them down to warehouses in the valleys, which pay handsomely.... They're mailed in the cool of night in a boxes of old pine cones.  It's a clever device: How do you pack a hundred living ladybugs?  The insects naturally crawl deep into the depths of the pine cones; the sturdy "branches" of the opened cones protect them through all the bumpings of transit." (p. 79-80)

"“There are seven or eight categories of phenomena in the world that are worth talking about, and one of them is the weather. Any time you care to get in your car and drive across the country and over the mountains, come into our valley, cross Tinker Creek, drive up the road to the house, walk across the yard, knock on the door and ask to come in and talk about the weather, you’d be welcome.” (p. 83)

"I allow the spiders the run of the house.  I figure that any predator that hopes to make a living on whatever smaller creatures might blunder into a four-inch square bit of space in the corner of the bathroom where the tub meets the floor, needs every bit of my support."  (p. 84)

Nature is, above all, profligate. Don't believe them when they tell you how economical and thrifty nature is, whose leaves return to the soil. Wouldn't it be cheaper to leave them on the tree in the first place? This deciduous business alone is a radical scheme, the brainchild of a deranged manic-depressive with limitless capital. Extravagance! Nature will try anything once.”(p. 106)

"This is salamander metropolis.  If you want to find a species wholly new to science and have your name inscribed Latinly in some secular version of an eternal rollbook, then your best bet is to come to the southern Appalachians, climb some obscure and snakey mountain where, as the saying goes, "the hand of man has never set foot," and start turning over rocks." (p. 174)

"Water lifting up tree trunks can climb one hundred and fifty feet an hour; in sull summer a tree can, and does, heave a ton of water every day." (p. 179)

"If you analyze a molecule of chlorophyll itself, what you get is one hundred thirty-six atoms of hydrogen, oxygen, and nitrogen arranged in an exact and complex relationship around a central ring.  At the ring's center is a single atom of magnesium.  Now: If you remove the atom of magnesium and in its exact place put an atom of iron, you get a molecule of hemoglobin."  (p. 200) Despite my science background, I had to look it up.  The similarity is truly remarkable - and understandable in functional terms:


"The average temperature of our planet is 57 degrees Fahrenheit.  (p. 203)

"There are, for instance, two hundred twenty-eight separate and distinct muscles in the head of an ordinary caterpillar."  (p. 209) ["I seem to possess an organ that others lack, a sort of trivia machine"]

"Certainly nature seems to exult in abounding radicality, extremism, anarchy. If we were to judge nature by its common sense or likelihood, we wouldn’t believe the world existed. In nature, improbabilities are the one stock in trade. The whole creation is one lunatic fringe…” (p. 229)

"The experimenters studied a single grass plant, winter rye. They let it grow in a greenhouse for four months; then they gingerly spirited away the soil—under microscopes, I imagine—and counted and measured all the roots and root hairs. In four months the plant had set forth 378 miles of roots—that's about three miles a day—in 14 million distinct roots. This is mighty impressive, but when they get down to the root hairs, I boggle completely. In those same four months the rye plant created 14 billion root hairs, and those little things placed end to end just about wouldn't quit. In a single cubic inch of soil, the length of the root hairs totaled 6000 miles." (p. 258)

"The egg of a parasite chalcid fly, a common small fly, multiplies unassisted, making ever more identical eggs. The female lays a single fertilized egg in the flaccid tissues of its live prey, and that egg divides and divides. As many as 2000 new parasitic flies will hatch to feed on the host's body with identical hunger. Similarly—only more so—Edwin Way Teale reports that a lone aphid, without a partner, breeding "unmolested" for one year, would produce so many living aphids that, although they are only a tenth of an inch long, together they would extend into space 2500 light-years." (p. 263)

"They [Eskimos] eat fish, goose or duck eggs, fresh meat, and anything else they an get, including fresh "salad" of greens still raw in a killed caribou's stomach and dressed with the delicate acids of digestion." (p. 287)

"The sentence in Teale is simple:  "On cool autumn nights, eels hurrying to the sea sometimes crawl for a mile or more across dewy meadows to reach streams that will carry them to salt water."  These are adult eels, silver eels, and this descent that slid down my mind is the fall from a long spring ascent the eels made years ago.  As one-inch elvers they wriggled and heaved their way from the salt sea up the coastal rivers of America and Europe, upstream always unto "the quiet upper reaches of rivers and brooks, in lakes and ponds--sometimes as high as 8,000 feet above sea level."  There they had lived without breeding "for at least eight years."  In the late summer of the year they reached maturity, they stopped eating, and their dark color vanished.  They turned silver; now they are heading to the sea..." (p. 345)
I always enjoy when authors use words that are unfamiliar to me:
"...a low hill trembling in yellow brome..."  A type of grass; directly from the Greek word bromos = oat.
"... clearly I had better be scrying the signs."  From Middle English to look into the future as with a crystal ball. 
"... a sycamore's primitive bark is not elastic but frangible..."  Able to be broken, fragile.  Often used for things that are intentionally breakable, as light poles on highways.
"... the waves are translucent, laving, roiling with beauty like sharks."  Washing; related to laundry and lavatory.
"A bobwhite who is still calling in summer is lorn..."  Doomed, lost, lonely.  More often seen as forlorn.
",,, salvifically, I hope, it seems bold."  Related to salvation.  Related to salvage.
"... it was a maple key, a single winged seed from a pair."  From context a fruit with a wing - but why?
"... convection currents hauling round the world's rondure where they must..."  Roundness (French)
"The snakeskin had unkeeled scales..." Obviously without a keel, generating a smooth surface, cf garter snakes which have keeled (rough) skin.
This was an interesting book, and an enjoyable read.  Like Teale, whom she quotes frequently, she excels at observation.  But her writing style incorporates more metaphysical aspects of the why behind events.
Phrase: "Spend the afternoon, you can't take it with you."  Or: "You see the creatures die, and you know you will die.  And one day it occurs to you that you must not need life.  Obviously.  And then you're gone... I think that the dying pray at the last not "please," but "thank you," as a guest thanks his host at the door."

For the TLDR crowd who just want a taste of the book, I would recommend Chapter 10 ("Fecundity") and Chapter 13 ("The Horns of the Altar"), but I think not the more famous Chapter 15 ("The Waters of Separation"), which was a bit too metaphysical for my taste.  If your copy has an "Afterword to the Twenty-fifth Anniversary Edition," that's worth reading.  Also any "about the author" section.

I'm sure many readers of this blog are quite familiar with Annie Dillard.  Please chime in with your comments and recommendations re her other books.

She was the King of Poland


Not queen.  King.  As explained in a QI post:
Jadwiga, canonised saint and the first female monarch of Poland, held the title of King as Queens couldn’t rule, but the law didn’t state that a King had to be male.

Ascending Mount Everest with a drone


YouTube videos have "fullscreen" icons for a reason; click it.  I also switched to a slower playback speed (0.5) for the final summit push.
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