Yes, here's the classifier:

def get_species(): return 'Canis familiaris'

Yep and all available online as well. I listen to PBS every day.

I don't think the article did a great job with their two digit illustration. They simply state:

(ad + bc) = ((a + b) × (c + d)) – ac – bd.

First note this equation is more clearly be written as:

ad + bc = (a + b)(c + d) – ac – bd.

To see why this is so first expand (a + b)(c + d).

(a + b)(c + d) = ac + ad + bc + bd

now

(a + b)(c + d) − ac − bd = ac + ad + bc + bd − ac − bd

Hence

ad + bc = (a + b)(c + d) – ac – bd.

Erm, I'm not sure you clarified anything other than removing one pair of spurious round brackets that who knows why they're there in the source material.

There are other weird formatting things in this article, which I blame on AI. I don't think the whole article was written by AI, but the copy-editing and formatting looks like an AI messed up things, such as those pointless round brackets or the inconsistency of multiplication (sometimes there is a × sign, sometimes there isn't), or this:

> have suspected that O(n²) was an inherent speed limit for multiplication. The celebrated Soviet math professor Andrey Kolmogorov posed the O(n^2)

The AI can't decide on notation.

The AI is just like me, then.

> The AI can't decide on notation.

It is sadly emblematic of how much SciAm has cheapened itself over the past decade. They used to care about technical details. Now they serve up poorly formatted rehashes of news (largely) from 65 years ago.

He sold 0.00004 % of his stock and Bitcoin dumped 25 % of its value

His company is losing money and the future hangs on their ability to borrow fiat in order to prop up bitcoin.

He is in an ironic and untenable position in my opinion.

BTW, I think the decimal in your stated percentage needs to shift 2 places to the left.

Amusingly "250" (二百五) is Chinese slang for idiot or halfwit. Wonder if it is somehow deliberate ?

https://contextualchinese.com/%E4%BA%8C%E7%99%BE%E4%BA%94

The web programmer is a handy thing for the D-50

https://data.dynareg.se/breadandbutter/D05.html

I think they were fairly common for things like gladiatorial games, jousting, etc.

That is neat, I did not know this method of constructing a gold ratio. Once you have a golden ration it's easy to construct a pentagon (with straight-edge and compass).

I'm not familiar with this pentagon trick. Care to elaborate?

The ratio of the length of the diagonal of a pentagon to one of its sides is the golden ratio -- easiest visualization is with similar triangles. Draw a regular pentagon (sides of length 1 for simplicity) and pick a side, make an isosceles triangle with that side as the base and two diagonals meeting at the opposite point. Go one side length down from the opposite point and mark that (F below). Convince yourself that triangle DCF is similar to CAD (symmetry gets you there).

Now we wish to find the length of, say, CA. From similarity CD/CA = FC/DF, and CD = DF = 1, and CA - FC = 1, so the ratio simplifies to... CA^2 - CA - 1 = 0 which yields the golden ratio.

            A
           .'.
         .' | `.
       .'  | |  `.
    B.'    | |    `.E
     \   F|   |    /
      \   |   |   /
       \ |     | /
        \|_____|/
        C       D

I'm not from the US, but here in Australia, the 2026 BYD atto EV is priced at 24k AUD. That's 16k USD. Also the infrastructure is there as most homes are connected to the electricity grid

Full title: Discovery of Late Intermediates in Methylenomycin Biosynthesis Active against Drug-Resistant Gram-Positive Bacterial Pathogens