Enlarge / Artist's conception of a dark matter filament containing a galaxy with large jets. (Caltech noted that some details of this image were created using AI.) (credit: Martijn Oei (Caltech) / Dylan Nelson (IllustrisTNG Collaboration).)

The supermassive black holes that sit at the center of galaxies aren't just decorative. The intense radiation they emit when feeding helps drive away gas and dust that would otherwise form stars, providing feedback that limits the growth of the galaxy. But their influence may extend beyond the galaxy they inhabit. Many black holes produce jets and, in the case of supermassive versions, these jets can eject material entirely out of the galaxy.

Now, researchers are getting a clearer picture of just how far outside of the galaxy their influence can reach. A new study describes the largest-ever jets observed, extending across a total distance of 23 million light-years (seven megaparsecs). At those distances, the jets could easily send material into other galaxies and across the cosmic web of dark matter that structures the Universe.

Extreme jets

Jets are formed in the complex environment near a black hole. The intense heating of infalling material ionizes and heats it, creating electromagnetic fields that act as a natural particle accelerator. This creates jets of particles that travel at a substantial fraction of the speed of light. These will ultimately slam into nearby material, creating shockwaves that heat and accelerate that, too. Over time, this leads to large-scale, coordinated outflows of material, with the scale of the jet being proportional to a combination of the size of the black hole and the amount of material it is feeding on.

Enlarge / Harvard Business School was targeted by a faculty member's lawsuit. (credit: APCortizasJr)

Earlier this year, we got a look at something unusual: the results of an internal investigation conducted by Harvard Business School that concluded one of its star faculty members had committed research misconduct. Normally, these reports are kept confidential, leaving questions regarding the methods and extent of data manipulations.

But in this case, the report became public because the researcher had filed a lawsuit that alleged defamation on the part of the team of data detectives that had first identified potential cases of fabricated data, as well as Harvard Business School itself. Now, the court has ruled on motions to dismiss the case. While the suit against Harvard will go on, the court has ruled that evidence-backed conclusions regarding fabricated data cannot constitute defamation—which is probably a very good thing for science.

Data and defamation

The researchers who had been sued, Uri Simonsohn, Leif Nelson, and Joe Simmons, run a blog called Data Colada where, among other things, they note cases of suspicious-looking data in the behavioral sciences. As we detailed in our earlier coverage, they published a series of blog posts describing an apparent case of fabricated data in four different papers published by the high-profile researcher Francesca Gino, a professor at Harvard Business School.

Enlarge (credit: Jarcosa)

Rapa Nui, often referred to as Easter Island, is one of the most remote populated islands in the world. It's so distant that Europeans didn't stumble onto it until centuries after they had started exploring the Pacific. When they arrived, though, they found that the relatively small island supported a population of thousands, one that had built imposing monumental statues called moai. Arguments over how this population got there and what happened once it did have gone on ever since.

Some of these arguments, such as the idea that the island's indigenous people had traveled there from South America, have since been put to rest. Genomes from people native to the island show that its original population was part of the Polynesian expansion across the Pacific. But others, such as the role of ecological collapse in limiting the island's population and altering its culture, continue to be debated.

Researchers have now obtained genome sequence from the remains of 15 Rapa Nui natives who predate European contact. And they indicate that the population of the island appears to have grown slowly and steadily, without any sign of a bottleneck that could be associated with an ecological collapse. And roughly 10 percent of the genomes appear to have a Native American source that likely dates from roughly the same time that the island was settled.

Enlarge / The CycWagon. (credit: John Timmer)

More so than most other forms of bicycle, cargo bikes are specifically designed to make ditching a car easier. Whether hauling groceries or kids, they can handle a lot more of the day-to-day errand running than most other forms of two-wheeled transport. The problem with some of the higher-end cargo bikes is that the upfront costs can be competitive with a decent used car (although operating costs will be dramatically lower) without offering quite the flexibility that a car might.

Fortunately, as Beth Mole discovered, you don't necessarily have to spend that much to get a decent riding experience, putting cars at a further disadvantage. That left me curious as to what the price floor for a decent cargo bike might be—how little can you pay and still get a satisfactory experience? I was also keen for a second try on my experiment of going a month without using a car, meant to happen during my earlier review but interrupted by wildfire smoke.

All of which explains why I took delivery of a $1,500 cargo bike called the CycWagon, from a company called Cycrown. It's currently well on its way toward getting me through a car-free month, but it has... well, a lot of issues.