Bismuth is known for a few things: its low melting point, high density, and psychedelic hopper crystals. A literal deep-dive into any molten metal would be a terrible idea, regardless of low melting point, but [Electron Impressions]’s video on “Why Do Bismuth Crystals Look Like That” may be the most educational eight minutes posted to YouTube in the past week.

The whole video is worth a watch, but since spoilers are the point of these articles, we’ll let you in on the secret: it all comes down to Free Energy. No, not the perpetual motion scam sort of free energy, but the potential that is minimized in any chemical reaction. There’s potential energy to be had in crystal formation, after all, and nature is always (to the extent possible) going to minimize the amount left on the table.

In bismuth crystals– at least when you have a pot slowly cooling at standard temperature and pressure–that means instead of a large version of the rhombahedral crystal you might naively expect if you’ve tried growing salt or sugar crystals in beakers, you get the madman’s maze that actually emerges. The reason for this is that atoms are preferentially deposited onto the vertexes and edges of the growing crystal rather than the face. That tends to lead to more vertexes and edges until you get the fractal spirals that a good bismuth crystal is known for. (It’s not unlike the mechanism by which the dreaded tin whiskers grow, as a matter of fact.)

Bismuth isn’t actually special in this respect; indeed, nothing in this video would not apply to other metals, in the right conditions. It just so happens that “the right conditions” in terms of crystal growth and the cooling of the melt are trivial to achieve when melting Bismuth in a way that they aren’t when melting, say, Aluminum in the back yard. [Electron Impressions] doesn’t mention because he is laser-focused on Bismuth here, but hopper crystals of everything from table salt to gold have been produced in the lab. When cooling goes to quick, it’s “any port in a storm” and atoms slam into solid phase without a care for the crystal structure, and you get fine-grained, polycrystaline solids; when it goes slowly enough, the underlying crystal geometry can dominate. Hopper crystals exist in a weird and delightful middle ground that’s totally worth eight minutes to learn about.

Aside from being easy to grow into delightful crystals, bismuth can also be useful when desoldering, and, oddly enough, making the world’s fastest transistor.

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Try an experiment. Next time you are in a room with someone, ask them to name everything in the room. Only certain kinds of people will say “air” or “light.” For most people, those are just givens, and you don’t think about them unless, for some reason, you don’t have them. Resistance is like that in electronics. You use it constantly, but do you ever think much about what it is? For a resistor, the value in ohms really represents the slope of the line that describes the amount of voltage you’ll see across the component when it carries a certain amount of current. For resistors, that slope is — at least in theory — constant and positive. But [Void Electronics] made a video exploring negative resistance, and it is worth watching, below.

If you haven’t seen negative resistance before, you might wonder how that is possible. Ohm’s law is just a shorthand for calculating the slope of a graph with voltage on the Y axis and current on the X axis. It works because the voltage and current are always zero at the same time, so the slope is (V-0)/(I-0), and we just shorten that to the normal Ohm’s law equation.

But not everything has a linear response to current. Some devices will have different slopes over different current regions. And sometimes that slope can be negative, meaning that an increase in current through the device will cause it to drop less voltage. Of course, this is usually just over a narrow range and, as [Void] points out, most devices don’t specify that parameter on their data sheets. In fact, some transistors won’t even work in the circuit.

The circuit in question in the video below the break is an odd one. It uses two resistors, an LED, and a transistor. But the transistor’s base is left disconnected. No 555 needed. How does it work? Watch the video and you’ll see. There’s even a curve tracer if you don’t like to see hand-drawn graphs.

We’ve looked at negative resistance more than once. There are a few exotic devices, like tunnel diodes, that are explicitly used for the negative resistance property. When the gas in a neon bulb breaks down, you get the same effect.

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The fact that there exist in our world flat rocks that make lightning when you point them at the sun is one of the most unappreciated bits of wizardry in this modern age. As hackers, we love all this of techno-wizardry–but some of us abhor paying full price for it. Like cars, one way to get a great discount is to buy used. [Backyard Solar Project] helped a friend analyze some 14-year-old panels to see just how they’d held up over the years, and it was actually better than we might have expected.

The big polycrystalline panels were rated at 235 W when new, and they got 6 of them for the low, low price of “get this junk off my property”. Big panels are a bit of a pain to move, but that’s still a great deal. Especially considering that after cleaning they averaged 180 W, a capacity factor of 77%. Before cleaning 14 years worth of accumulated grime cost about eight watts, on average, an argument for cleaning your panels. Under the same lighting conditions, the modern panel (rated to 200 W) was giving 82% of rated output.

That implies that after 14 years, the panels are still at about 94% of their original factory output, assuming the factory wasn’t being overoptimistic about the numbers to begin with. Still, assuming you can trust the marketing, a half a percent power drop per year isn’t too bad. It’s also believable, since the US National Renewably Energy Laboratory (yes, they have one) has done tests that put that better than the average of 0.75 %/yr. Of course the average American solar panel lives in a hotter climate than [Backyard Solar Project], which helps explain the slower degradation.

Now, we’re not your Dad or your accountant, so we’re not going to tell you if used solar panels are worth the effort. On the one hand, they still work, but on the other hand, the density is quite a bit lower. Just look at that sleek, modern 200 W panel next to the old 235 W unit. If you’re area-limited, you might want to spring for new, or at least the more energy-dense monocrystalline panels that have become standard the last 5 years or so, which aren’t likely to be given away just yet. On the gripping hand, free is free, and most of us are much more constrained by budget than by area. If nothing else, you might have a fence to stick old panels against; the vertical orientation is surprisingly effective at higher latitudes.

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The function of an LED is to emit light when the device is forward biased within its operating range, and it’s known by most people that an LED can also operate as a photodiode. Perhaps some readers are also aware that a reverse biased LED also has a significant capacitance, to the extent that they can be used in some RF circuits in the place of a varicap diode. But how do those two unintentional properties of an LED collide? As it turns out, an LED can also behave as a light dependent capacitor. [Bornach] has done just that, and created a light dependent sawtooth oscillator.

The idea is simple enough, there is a capacitance between the two sides of the depletion zone in a reverse biased diode, and since an LED is designed such that its junction is exposed to the external light, any photons which hit it will change the charge on the junction. Since the size of the depletion zone and thus the capacitance is dependent on the voltage and thus the charge, incoming light can thus change the capacitance.

The circuit is a straightforward enough sawtooth oscillator using an op-amp with a diode in its feedback loop, but where we might expect to find a capacitor to ground on the input, we find our reverse biased LED. The video below the break shows it in operation, and it certainly works. There’s an interesting point here in that and LED in this mode is suggested as an alternative to a cadmium sulphide LDR, and it’s certainly quicker responding. We feel duty bound to remind readers that using the LED as a photodiode instead is likely to be a bit simpler.

This project is part of the Hackaday Component Abuse Challenge, in which competitors take humble parts and push them into applications they were never intended for. You still have time to submit your own work, so give it a go!

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Possono alterare la nostra mente, guarirci dalle malattie e persino aiutarci a evitare catastrofi ambientali. Hanno un metabolismo straordinario, contribuiscono alla rigenerazione del suolo e sono protagonisti di tantissimi processi naturali. I funghi sono ovunque, ma è facile non notarli. Sono dentro e fuori di noi. Anche mentre leggete questo libro, stanno modificando il flusso della vita, come fanno da milioni di anni. Merlin Sheldrake ci accompagna in un percorso che sconvolgerà tutte le nostre percezioni e da cui si esce con una visione completamente stravolta del pianeta e della vita stessa. Questa nuova edizione, rielaborata dall’autore a partire dal testo originale, è arricchita da più di cento spettacolari immagini a colori in grado di mostrare la straordinaria varietà, le bizzarrie e la bellezza dei funghi come mai prima d’ora.

Editore: Marsilio
Formato: Copertina rigida con sovvracopertina
Anno edizione: 2023
Condizioni: Nuovo
Pagine: 240

Per info, dettagli e acquisti scriveteci o venite a trovarci in libreria o su www.semidinchiostro.com (link in bio).

Libreria Semi d'inchiostro
Via Serraloggia 24, Fabriano

Per la soggettazione del fascicolo n. 2-2025 della Bibliografia Nazionale Italiana, serie Monografie, abbiamo introdotto nel Thesaurus del Nuovo soggettario i seguenti nuovi termini di soggetto:

• Fonti cartografiche IT 2025-1968
• Mercanti bolzanini IT 2025-1421
• Scrittrici italo-canadesi IT 2025-​1784

Per i fascicoli precedenti rimandiamo alla pagina BNI dedicata.

L'articolo BNI notizie 2-2025 proviene da Biblioteca nazionale centrale di Firenze.

If fewer newspapers exist to request public records, does the government become less transparent? That’s the question at the heart of “Dark Deserts,” a new research paper by David Cuillier of the Freedom of Information Project at the Brechner Center for Advancement of the First Amendment and law student Brett Posner-Ferdman.

Cuillier, who’s taught more than 10,000 journalists, students, and citizens how to wrest public records from government agencies, told us about what he and Posner-Ferdman found and what it means for the public’s right to know.

Let’s start with the big finding of “Dark Deserts”: States with fewer local papers and weaker press associations are more likely to break public records laws. Why does that matter for everyday people?

This is incredibly important for all of us because we are reaching the transparency tipping point — where we will lose any effective ability to see what our governments are up to.

We know from research that public record laws directly lead to less corruption, cleaner drinking water, and safer restaurants. According to Stanford economist James Hamilton’s research, for every dollar spent on public records journalism, society benefits $287 in saved lives and more efficient government. Freedom of information ensures concrete benefits for all of us.

Yet, we are losing it very quickly. According to the Department of Justice’s own statistics, if you asked for a record in 2011, you would get it about 38% of the time. Now it’s down to 12%. We see the same downward trends in the states. What happens when it gets to 0%?

The death of transparency will affect all of us in the pocketbook, in the quality of government services we receive, and in the loss of liberties we hold sacred as Americans.

The death of transparency will affect all of us in the pocketbook, in the quality of government services we receive, and in the loss of liberties we hold sacred as Americans.

David Cuillier

Surprisingly, you found that having more digital-only media outlets doesn’t result in better public records request compliance. Why do you think that is, and what advice would you give to digital outlets trying to hold government accountable?

It is difficult to know for sure. For one, there aren’t as many data points to effectively measure their effects as well as we would like. For example, the Institute for Nonprofit News membership stands at about 500 so far and there are 3,143 counties in the country. A strong, local, independent digital outlet might have an effect on local compliance with public record laws, but there probably aren’t enough to have an impact on state agencies.

Also, while many are doing great work, I suspect they have less influence at a statewide level than newspapers. A lot of digital-only outlets don’t have the funds to sue for public records. Also, my sense is that government officials don’t take digital-only media outlets as seriously, and that politicians are essentially blowing them off and not considering them “real” journalism. That is too bad, because many are doing better journalism than legacy media.

Digital-only outlets will need to double down on public records. And support organizations like Freedom of the Press Foundation, Reporters Committee for Freedom of the Press, MuckRock, state FOI coalitions, and others can help.

Beyond subscribing to their community’s newspaper or supporting funding for journalism, what can people who care about press freedom and transparency do to encourage state governments to take their public record laws seriously?

Of course, write to your local city council, legislator, governor, and congressional representatives. They listen if enough people speak up. But everyone says that, right? And how many people actually act?

The solutions will take much more work than strongly worded letters. It’s time for other institutions to fill the gap. Nonprofits with an agenda are probably our last hope — American Oversight, Heritage Foundation, Judicial Watch, ACLU, League of Women Voters, etc. A new citizen-driven nonprofit in Jacksonville, “Nassau County DOGE,” has been pushing for public records. Environmental groups and those seeking police reform and rights for transgender Americans are pushing for records. Whatever your passion is, join an organization that will fight for your right to know.

The solutions will take much more work than strongly worded letters. It’s time for other institutions to fill the gap.

David Cuillier

Then, we need strong coordinating bodies, such as state freedom of information coalitions, to help direct these energies toward real legislative reform and litigation. One thing I’ve noticed is that all it takes is one or two passionate people in a state to make a huge difference in freedom of information. It really is doable!

What states have the strongest public records law, and what sets them apart? If you had the power to rewrite public records laws, what’s the one thing you’d add or fix right away?

No state is perfect. But most of the studies indicate that the states with the best compliance overall with public record laws tend to be Washington, Idaho, Connecticut, and some others. The most effective changes to public records laws rely on four things.

First, we need mandatory attorney fee-shifting in every state, where agencies are required to cover the attorney fees of people who sue for public records and prevail. In the third of the states that have this, there are attorneys happy to sue on behalf of journalists and others, with the hope they will get paid.

Second, strong financial penalties for noncompliance are critically important. Washington is probably the most transparent state overall, because if an agency breaks the law, is sued, and loses, it can be forced to pay up to $100 per record per day that it dinged the requester around. That can add up to hundreds of thousands of dollars.

Third, elimination of search and redaction fees, which are abused terribly. There are some countries where no fees are charged at all, and it works very well. In reality, fees collect very little of the actual cost of administering public record laws — less than 1%-3% according to most studies. Yet, they are wielded by agencies to make people go away, particularly journalists.

Lastly, and probably most importantly, we need alternative enforcement mechanisms in addition to court. Not everyone can afford to hire an attorney and sue. We need independent information commissions in every state to enforce the law and punish bad agencies, as they have in Connecticut, Pennsylvania, and Ohio, and in more than 51 nations across the planet.

You’re also a member of the federal Freedom of Information Act Advisory Committee. What’s something you’d fix in the federal FOIA?

So many fixes, so little time.

The FOIA Advisory Committee, since its inception in 2014, has provided 67 recommendations to improve the law and process, yet the most substantive suggestions have mostly been ignored. Amendments every decade or so tweak the law but are insufficient in keeping up with increasing secrecy.

I’ve noticed that in Washington, D.C., there tends to be a culture of exceptionalism, that we are the king of democracy in the world and have the best law on the books. In reality, FOIA’s strength on paper is rated in the bottom half of the 140 nations that have public record laws — 78th, to be exact. That is embarrassing. So many improvements could be made if we swallow our pride and look to other countries for guidance.

FOIA’s strength on paper is rated in the bottom half of the 140 nations that have public record laws — 78th, to be exact. That is embarrassing.

David Cuillier

For example, we need an independent agency with the power to enforce the law on behalf of citizens, like we see in dozens of other countries. We need stiff penalties — even firing and jail time — for intentional noncompliance of FOIA, as they have in Ghana, Barbuda, and Finland. We need direct funding of FOIA offices by Congress to carry out the FOIA mission, particularly now as agencies are gutting staff. We need better technology to search for records and redact. We need FOIA to be applied to all branches of government, and to private corporations that conduct taxpayer-funded business on behalf of the government, as in South Africa, Armenia, and Colombia.

A lot of people consider these ideas extreme, yet they are common in other countries. We can do better.

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What has the EDRi network been up to over the summer? Find out the latest digital rights news in our bi-weekly newsletter. In this edition: Digital protection at stakes – and how we are fighting back.

The post EDRi-gram, 16 October 2025 appeared first on European Digital Rights (EDRi).

On 2 October 2025, the Dutch court made clear that users should be in control of content they see on Meta’s apps. In a landmark victory for digital rights, the judge sided with Bits of Freedom against Meta, ruling that the company is violating the law and it has to adjust its app to respect users’ choices.

The post Judge in the Bits of Freedom vs. Meta lawsuit: Meta must respect users’ choice appeared first on European Digital Rights (EDRi).

ECNL, Liberties and the Hungarian Civil Liberties Union called on the EU to protect Pecs Pride participants from AI surveillance.

The post The Commission must uphold the AI Act and fundamental freedoms in Hungary appeared first on European Digital Rights (EDRi).

Despite its somewhat disappointing enforcement so far, the EU’s Digital Market Act has become a global role model for modern antitrust policy. While Europe figures out its implementation, we should already work on expanding the law’s scope and strengthen its provisions. Here is how to make the DMA even better.

The post The DMA is a success, it should be strengthened and expanded appeared first on European Digital Rights (EDRi).