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Does Every Species Get a Billion Heartbeats Per Lifetime?

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There’s an assumption that because of the relationship between metabolic rates, volume, and surface area, animals get an average of one billion heartbeats out of their bodies before they expire. Turns out there’s some truth to it.

One Billion Heartbeats

As animals get bigger, from tiny shrew to huge blue whale, pulse rates slow down and life spans stretch out longer, conspiring so that the number of heartbeats during an average stay on Earth tends to be roughly the same, around a billion.

Mysteriously, these and a large variety of other phenomena change with body size according to a precise mathematical principle called “quarter-power scaling”.

It might seem that because a cat is a hundred times more massive than a mouse, its metabolic rate, the intensity with which it burns energy, would be a hundred times greater. After all, the cat has a hundred times more cells to feed.

But if this were so, the animal would quickly be consumed by a fit of spontaneous feline combustion, or at least a very bad fever. The reason: the surface area a creature uses to dissipate the heat of the metabolic fires does not grow as fast as its body mass.

To see this, consider a mouse as an approximation of a small sphere. As the sphere grows larger, to cat size, the surface area increases along two dimensions but the volume increases along three dimensions. The size of the biological radiator cannot possibly keep up with the size of the metabolic engine.

Humans and chickens are both outliers in this respect…they both live more than twice as long as their heart rates would indicate. Small dogs live about half as long.

[This is a vintage post originally from Feb 2013.]

Tags: biology · science · timeless posts

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bluebec
23 hours ago
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cjheinz
1 day ago
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How interesting! Make the most of your 2 billion heartbeats.
Lexington, KY; Naples, FL

Boléro: 'Beautiful symptom of a terrible disease'

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“Unraveling Bolero” and Dementia

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If you’ve never heard of Radiolab, I highly recommend listening to their podcasts. A couple months ago, I was driving back to school and listening to one titled “Unraveling Bolero.” My dad had sent it to me multiple times and told me that he thought I would really enjoy it, but I continued to push it off. Once I finally listened to it, I was immediately fascinated by the story they told.

The podcast tells of a successful scientist named Anne Adams. After her son was in a car accident, she decided to stay home full time to take care of him. While spending her time at home with her son, she suddenly decides to become a full time painter and obsessively paints strawberries.

After a while, she starts to paint other things as well. The one that gathered some attention was her painting titled Unraveling Bolero. Anna set out to create a painting of Maurice Ravel’s famous composition titled Bolero. How she could have possibly painted a piece of music? Well, she deconstructed the entire composition and matched pitches, melodies and bases to colors; for example, B flat was a metallic green. The end result was a creation consisting of two panels. The thought that went into creating this is astounding. Unraveling Bolero started to reveal her repetitive, obsessive tendencies.

Now, let’s travel back in time a bit. The man who composed Bolero is named Maurice Ravel. When making this composition, he decided to repeat the melody continuously instead of developing it; he simply had the orchestration grow around the melody. Six years later, Bolero started to forget words. By 1935, Ravel couldn’t write or speak anymore. He tried to relearn the alphabet – to no avail.

Let’s go back to Anne. Six years after Anne created her painting, she started to also have problems with forgetting words and speaking. Eventually, it was found that she had frontotemporal dementia (FTD). Interestingly, this is what Ravel was found to have as well; this was discovered when an autopsy revealed one of the lobes in the brain had sunk because it was disintegrating. Both had a major interest in the composition Bolero, which highlighted their obsession with repetition.

Now, what is frontotemporal dementia? In short, it refers to a group of disorders that are caused by progressive nerve loss in the frontal or temporal lobes of the brain (2). Essentially, portions of the lobes shrink, or atrophy (4).

It is classified into three clinical variants: (1)

  • Behavioral-variant: associated with early behavioral and executive deficits
  • Non-fluent variant: deficits in speech, grammar, and word output
  • Semantic-variant: disorder of semantic knowledge and naming

Symptoms may include some of the following (although there are MANY more as well): (4)

  • Repetitive, compulsive behavior
  • Apathy
  • Lack of judgment and inhibition
  • Lack of awareness of thinking or behavioral changes
  • Impairment or loss of speech
  • Tremors
  • Rigidity

Sadly, the cause of frontotemporal dementia is unknown. Possibilities include mutations on several genes, although that itself likely would not cause FTD. Many people with FTD have these small structures called Pick bodies in their brain cells, which have an abnormal amount (or type) of protein (3). It is hard to narrow any complex disease or health condition down to a single cause, because there are so many interacting factors that may cause problems.

Okay, since we know a bit about FTD, let’s go back to Anne and Ravel. Where did this obsession with repetition come from? Although there is not an explicit answer for this, there are a couple theories out there. There are several parts of the brain that can inhibit certain occurrences (such as if the basal ganglia said “move, eat, run”), and there is a possibility that the structures in the brain dedicated to language can help inhibit some of these. However, when the language part of the brain is not able to do that, then certain motor commands may flow up, too. In the early stages of their illnesses, Anne and Ravel had the ability to make sense of it all and create either amazing artwork or a famous musical composition. There was enough of the cortex available to act upon this desire to repeat. However, as their cortices atrophied, they could make less and less sense of these impulses, and they made simpler creations.

This story of Anne and Ravel helps show how this disease is a problem many people face, and that it can manifest in different ways. There needs to be more research on it, and more people should know what it is.

References:

  1. Bang, J. Spina, S. Miller, B. Frontotemporal dementia. The Lancet. 386:24-30. https://doi.org/10.1016/S0140-6736(15)00461-4.
  2. “Frontotemporal Dementia.” Alzheimer’s Disease and Dementia. https://http://www.alz.org/alzheimers-dementia/what-is-dementia/types-of-dementia/frontotemporal-dementia.
  3. “Frontotemporal Dementia.” Frontotemporal Dementia. Johns Hopkins Medicine Health Library. https://www.hopkinsmedicine.org/healthlibrary/conditions/nervous_system_disorders/frontotemporal_dementia_134,77.
  4. “Frontotemporal Dementia.” Mayo Clinic, Mayo Foundation for Medical Education and Research, 29 Oct. 2016. https://www.mayoclinic.org/diseases-conditions/frontotemporal-dementia/symptoms-causes/syc-20354737.
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bluebec
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Tori Amos on trauma, Trump and Neil Gaiman: ‘It’s a heartbreaking grief’

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By the third UK lockdown, Tori Amos was wondering if she would ever play live again. At her remote house in Cornwall, where we meet, she began mourning the loss of connection with her audience. When the US singer and songwriter is on tour, giving her famously passionate performances, hundreds of letters pour in every day, requesting songs. “I try to read as many as I can, and we change the show every night, except the bookends. Anything else is up for grabs.”

Her relationship with her fans has always been collaborative. They tell her things. They trust her. In person, she has an open-book quality that immediately draws you in. When I arrive at her place – a detached but unassuming house upfront, and a warren of more recently built workshops at the back, filled with beautiful pianos, a massive mixing desk and the harpsichord she played on her album Boys for Pele – we have lunch with her husband and sound engineer, Mark Hawley. The conversation roams through football, raving, legal training (their 24-year-old daughter Tash is studying law in Washington DC) and how good the pumpkin soup is.

Amos has a friendly air, considering everyone thoughtfully from behind her glasses. At the start of her career she was often referred to as kooky, but she contains multitudes. Literally. She has 11 muses, she says – spirit guides – that help her creatively. But she’s definitely as much at home in the real world. It takes practicality and resilience to go from being a piano prodigy at five to having a thriving career at 61 in the notoriously difficult and often sexist music industry.

Her work draws people into her confidence. The first single from her first solo album, Little Earthquakes, in 1992, was Me and a Gun, a haunting a cappella account of her own experience of sexual trauma, breathtakingly direct in its lyrics and delivery. “It was me and a gun / And a man on my back / And I sang Holy holy / As he buttoned down his pants”. In her 15 studio albums since, she has written about all manner of things – Ocean to Ocean in 2021 was inspired by the death of her mother a few years earlier, as well as by the pandemic and the storming of the Capitol on 6 January. But that achingly open first album, its songs including classics such as Silent All These Years and Girl (“She’s been everybody else’s girl / Maybe one day she’ll be her own”), unlocked a door for her fans. Ever since, they have streamed through it, and her shows have provided a place for them to express their collective trauma.

When she finally got back on the road in 2022, after five years – her longest break from touring since Little Earthquakes – that connection with her audience resumed, and is powerfully captured on her new album, Diving Deep Live. “Some had been working in healthcare. Some on the frontline had suffered what I would say were terrible outbursts from the public.” When people were making song requests, they were “usually wrapping it around an experience … Once you read what somebody has been through and they have attached a song to it, that song expands. I begin to see it in a different way, because I had no idea that this song helped this person when their partner committed suicide. Or this person sees this song in a certain way because it made them smile when they weren’t feeling well.”

In July, she was in the US, where she heard conversations that left her unsurprised by November’s election result. When she arrived back in the UK, her manager, John Witherspoon, told her about allegations that had been made against the writer Neil Gaiman, her close friend ever since Little Earthquakes. (She mentioned him in the song Tear in Your Hand – “If you need me, me and Neil’ll be hangin’ out with the dream king” – and they have collaborated on all sorts of projects since.)

The Gaiman allegations were made on Master, a podcast by Tortoise, the first episodes of which were released on 3 July this year. Rachel Johnson and fellow journalist Paul Caruana Galizia spoke first to two women, and eventually to five in total, who allege sexual misconduct by Gaiman. The podcast begins with a young woman called Scarlett, who had been sent to Gaiman’s house to babysit. His child turned out to be on a playdate, so Scarlett, who was 22 at the time, was alone with Gaiman. He ran her a bath and then, she alleges, sexually assaulted her within hours of first meeting him. He says he had established consent for their physical contact in the bath (in his account it was only cuddling and making out) and denies all allegations of sexual misconduct by all five women.

I ask Amos how she felt when she first heard the allegations. “Shocked,” she says. A long pause. “And if the allegations are true, that’s not the Neil that I knew, that’s not the friend that I knew, nor a friend that I ever want to know. So in some ways it’s a heartbreaking grief. I never saw that side of Neil. Neither did my crew. And my crew has seen a lot.”

She says it’s devastating for the women involved, and I ask if she has listened to the podcasts. “No,” she says. “But I’ve read …” She looks as if she’s about to cry. “He’s godfather to Tash.” Her eyes well up. She struggles to contain herself. “My manager was the one who told me, because the girls” – Tash and her cousin, Kelsey – “found out about it from a paper. Tash said, ‘Kels, we’re not telling Mom’ – they call me ‘T-Bird’, but she might have said ‘Mom’ here. But she said, ‘We’re not telling Mom right now, we’re going straight to John [Witherspoon], because we don’t know, first of all, the legality. We have to work through this, and it’s the holiday weekend [4 July is Independence Day in the US], and Mom has to work through this.’

“And so John said, ‘I will speak to her as soon as she gets off the plane,’ and that’s what happened.

“I haven’t publicly said anything because: what do I say? I didn’t hire the nannies. I wasn’t there. I’ve never met these people. And I’ve never received a letter – of the thousands of letters I’ve gotten in 33 years – I’ve never received anything that was about Neil, except praise for his work and how much his work meant to people. That’s all I ever knew.”

She looks crestfallen and hollowed out, as anyone would, but especially someone who has spent so much of their career advocating for survivors. One of the women who has made allegations against Gaiman says he mentioned Amos to her, and said he could get her full-time work on the singer’s rape helpline – a reference to the Rape, Abuse & Incest National Network (RAINN), the largest anti-sexual violence organisation in the US.

Amos was the first spokesperson for the organisation (not a co-founder, as she is often described), which was set up after a show she did in the US midwest in 1994. During her performance of Me and a Gun, “a young woman – a girl, in her teens, I believe – collapsed and was taken, of course, backstage, and I went to see her afterwards. She said to me something like: can I get a job, anything, so I don’t have to go home, because my stepfather raped me last night, and he’ll rape me tonight when I get in? And I said, naively, ‘Of course. Of course.’ And my tour manager called management back in California and said, ‘T’s made up her mind to do this. To take this girl.’ And they called back and said ‘she’ll be arrested for kidnapping’.

“And I watched that girl walk out the door. And I’ve never seen her again. Or heard from her. Nothing. Or any reference to her. And I was able to work with the women at the record label at the time – they were feminists and good women at Atlantic records – and they paired us with Scott Berkowitz, who had started the Rape Crisis idea of connecting a hotline across the country. It was a joining of forces to get that off the ground.”

Does she feel the world has improved, generally, for women in the 30 years since RAINN began? “No,” she says bluntly, before adding that there are “places for women to reach out to that were harder to find back then”. On that night in 1994, there was nowhere “to direct that young girl to, and that was the motivating factor, being so frustrated … So I think when we ask if things have improved, I think there are services that have improved, but the fact we’re looking at an administration whereby there seems to be almost a gender apartheid happening, and where misogyny is common practice … I just didn’t think, after the last four years of the Trump administration, that women would have to face this again.”

We turn to her experiences as a young musician, growing up in Maryland. Did she have a moment at the piano where she knew this was what she would be doing for the rest of her life? She says her cousin Martha, who was a teenager when she was a toddler, recently told her that watching her play the piano with both hands at two and a half was like something out of the Twilight Zone. At five, Amos began attending the Peabody Institute of the Johns Hopkins University – one of the youngest student ever to be accepted – studying alongside teenagers, until she grew frustrated with the way she was being taught, losing her place at 11. At 13, she started playing in gay bars, building an enormous repertoire of songs.

“I really think the piano became my first – no, maybe my Mom was my first friend,” she says, “but the piano became a true friend that has never let me down. She has never betrayed me. I have betrayed her.”

In what way? “When I started listening to some of the boys’ club in the record industry in my 20s and instead of exploring my original voice and finding out what that is, I started chasing things on the radio.” This was when she made her first album, in Los Angeles, as part of a group called Y Kant Tori Read. It was not well received. “Someone called me a third-rate Pat Benatar. But I would say I was at least a fifth-rate Benatar.

“That failure took me to a place of such lowness, where I heard laughter in this restaurant on Santa Monica Boulevard that I would go to. It was kind of an industry hangout, and I heard laughter as I walked past. Not that anybody knew who I was, but LA at the time could be a very small place. Especially if you’re at the bottom of the food chain, you know?

“So in that moment, with tears rolling into my spaghetti, I just said to myself, ‘Tori, how did you manage to go from prodigy to bimbo?’ Billboard had referred to the music as ‘bimbo’. It was such an awakening.”

Does she really think people were laughing at her? “Oh yeah, I do. Because the one thing that people in LA do not wanna catch is failure. More than anything else in that town, I really believe that that is the plague for them.”

But without that failure, she couldn’t have written Little Earthquakes, and all the albums since; couldn’t have had a massive international hit with Cornflake Girl (likely the only song about female genital mutilation ever to trouble the charts); couldn’t have written the wildly experimental album Boys for Pele, and seen a remix of its song, Professional Widow, become a dance classic (and perhaps the ultimate anthem of enthusiastic consent, with its refrain, “Honey bring it close to my lips”). She couldn’t have experienced some of the greatest critical acclaim of her career for Ocean to Ocean. “I had to go through that,” she says. “It was sort of my moment of moment, after years of having let my instrument down, turning my back on it, because I drank the Kool-Aid.”

Does she still feel she has to battle sexism now? “Well, that’s an interesting question,” she says. “We don’t know what we’re facing, with a president who seems to be fireproof. So, with the population feeling emboldened – some of them – I don’t know what kind of behaviour we’re going to have to deal with. But, in some ways, because of where I am in my life, I’m sure that I have met men who treat me differently.” To the way they treat other women? “Yes. And is that because they dared not show it to me? Because I won’t tolerate it.” Her steely side comes out. “I won’t tolerate it. I won’t tolerate it with the crew …” You won’t let it happen around you? “No. No.” And people know that? “Oh yeah. Yes. But possibly there are wolves in sheep’s clothing.” She gives me a meaningful look. “And clearly we talked about that earlier.”

  • Diving Deep Live (Decca Records) is released on 6 December.

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JW Space Telescope Discovers Aliens!

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the famous pillars of creation astronomical objects with googly eyes on them

I know astronomical imagery is on the verge of being over-processed these days (those colors don’t exist out there!), but this image from the JWST is shocking. Clear evidence of Sesame Street’s Yip Yip Martians from billions of years ago. What did Jim Henson know and when did he know it?

Tags: astronomy · James Webb Space Telescope · remix · Sesame Street · space

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The Clever Design That Keeps This School Cool in Scorching Heat

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In this video, Sara Saadouni explains the three passive cooling techniques used by fellow architect Diébédo Francis Kéré in designing a school building in Burkina Faso, where temperatures can be quite warm all year. The roof is especially clever.

He introduced a curved double roof that created an air gap between the first and second roof. As the heat naturally rises and escapes into the gap, the prevailing winds quickly carry it away, accelerating this process and cooling the building more efficiently.

But that’s not all. The first roof is made up of perforated ceiling slabs, allowing the heat to escape more efficiently and therefore to be quickly transported by the wind.

The other genius idea was to also curve the roof, which allowed for the Venturi effect — a phenomenon where air speeds up as it moves through the narrower sections created by the curve and therefore boosting natural ventilation.

(via the kid should see this)

Tags: architecture · Burkina Faso · Diebedo Francis Kere · energy · physics · Sara Saadouni · science · video

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