Robin Dunbar, an anthropologist from England, has been studying and refining his theory on how large human networks can realistically get. Graphic by Miguel Tovar/University of Houston

You go to conferences; you network; you collaborate — all researchers and academics do. But do you need more than 150 contacts? Linkedin, Facebook, Twitter — all of these platforms open us up to the possibility of thousands of acquaintances, though fewer we would refer to as "friends."

Studying the primate brain

Robin Dunbar, an anthropologist from England, has been studying and refining his theory of the "Dunbar number" for 30 years. Dunbar became convinced that there was a ratio between brain sizes and group sizes through his studies of primates. "This ratio was mapped out using neuroimaging and observation of time spent on grooming, an important social behavior of primates. Dunbar concluded that the size, relative to the body, of the neocortex – the part of the brain associated with cognition and language – is linked to the size of a cohesive social group," wrote Christine Ro in a 2019 BBC.com Future article.

After the group reached approximately 150, it collapsed.

Your network

Is it true that humans based on their brain, and especially pre-frontal lobe size, are only able to connect in an intimate manner with around 150 other individuals? Defined as someone you would make plans to have a drink or coffee with if you bumped into them randomly on the street, Dunbar's claim is that it seems to be a consistent theme throughout history. Says the BBC: "This rule of 150 remains true for early hunter-gatherer societies as well as a surprising array of modern groupings: offices, communes, factories, residential campsites, military organizations, 11th Century English villages, even Christmas card lists."

The Dunbar number decreases by a "rule of three" where the next step down is the number 50 – those you consider "friends." Then about 15 in a closely knit circle, and four to six only in our familial or closest friend contacts.

Social media and COVID-19

"What determines these layers in real life, in the face-to-face world… is the frequency at which you see people," says Dunbar. "You're having to make a decision every day about how you invest what time you have available for social interaction, and that's limited." So, social media and COVID would seem to be game-changers for this theory.

Dunbar went on to study the process of "grooming" and light touch with astonishing results, which you can read about in the New Yorker. Basically, if a person has a face-to-face encounter with a friend, they are consequently able to withstand unpleasantness right afterwards (their hands stuck into a bucket of ice, for instance!) at a much higher rate.

"It makes sense that there's a finite number of friends most individuals can have," wrote Ro. "What's less clear is whether that capacity is being expanded, or contracted, by the ever-shifting ways people interact online …'It's extremely hard to cry on a virtual shoulder,' Dunbar deadpans."

And how has COVID changed Dunbar's theory? "While our culture has encouraged us to accumulate friends, both on- and offline, like points, the pandemic has laid bare the distinction between quantity and quality of connections," said a New York Times article. "There are those we've longed to see and those it's been a relief not to see."

The Big Idea

Many try to debunk Dunbar's number, by saying that primate and human brains differ and that the calculations are off. Robin Dunbar defends his theory thirty years after first proposing it in The Conversation.

The number of people you can just recognize according to Dunbar, is about 1,500, so you might want to keep that in mind if you are an extrovert and have an incredibly large network of collaborators – both online and offline.

University of Houston's central research department, the Division of Research, has about 100 members. But, your Linkedin network — check the number and see what it sits at. And if it's 600, ask yourself: do you really need that many contacts?

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This article originally appeared on the University of Houston's The Big Idea. Sarah Hill, the author of this piece, is the communications manager for the UH Division of Research.

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Report: Houston's hot medical office market might be on track to cool

by the numbers

Houston’s medical office market is on a roll.

A report from commercial real estate services company JLL shows net absorption and transaction volume saw healthy gains in 2022:

  • The annual absorption total of 289,215 square feet was 50.5 percent higher than the five-year average.
  • Transaction volume notched a 31.7 percent year-over-year increase.

Meanwhile, net rents held steady at $26.92 per square foot, up 1.3 percent from the previous year. The fourth-quarter 2022 vacancy rate stood at 15.9 percent.

Despite those numbers, the report suggests a slowdown in medical office rentals may be underway.

“Tenants who may have previously considered building out or expanding their lease agreements are now in a holding pattern due to increased construction costs and higher interest rates,” the report says. “These factors are having a direct impact on financial decisions when it comes to lease renewals, making it more likely that tenants will remain in their existing location for the foreseeable future.”

Still, the report notes “a number of bright spots for the future of healthcare in Houston.” Aside from last year’s record-high jump in sales volume, the report indicates an aging population coupled with a growing preference for community-based treatment “will lift demand even higher in coming years.”

The report shows that in last year’s fourth quarter, 527,083 square of medical office space was under construction in the Houston area, including:

  • 152,871 square feet in the Clear Lake area.
  • 104,665 square feet in the South submarket.
  • 103,647 square feet in Sugar Land.
Last fall, JLL recognized Houston as a top city for life sciences. According to that report, the Bayou City lands at No. 13 in JLL’s 2022 ranking of the country’s top 15 metro areas for life sciences. JLL says Houston “is poised for further growth” in life sciences.

Houston financial services firm announces acquisition, plans to grow

M&A radar

A Houston-based financial services company has made a recent strategic acquisition that gives it a new banking status.

LevelField Financial, which is creating a platform that combines traditional banking and digital asset products and services, announced this week that it is acquiring Burling Bank, an FDIC-insured, Illinois state-chartered bank. According to the company, once it receives regulatory approval, "LevelField will be the first full-service bank to offer fully compliant traditional banking and digital asset services."

The financial terms of the deal's transaction, which is expected to close later this year, were not disclosed.

The combined company will be able to provide traditional banking services, as well as LevelField's digital asset management. Burling Bank's senior management team will join LevelField's leadership, per a press release. They will focus on serving the bank's existing clients and growing the banking business nationwide.

"We conducted a broad review of banks in the U.S. to find the ideal institution with both an existing business and a management team who are aligned with our vision; we exceeded our expectations with Burling Bank. With this acquisition, LevelField will become a traditional bank, albeit one serving customers interested in the digital asset class," says Gene A. Grant II, CEO of LevelField Financial, in the release.

"We are thrilled to have the Burling executives join our leadership team, and together we intend to deliver fantastic customer service and well-designed products to customers who have an interest in accessing the digital asset class through a traditional bank," he continues.

Founded in 2018 by former banking executives, LevelField's leadership believes "the future of money is digital and that banks will continue to be a trusted provider of financial services," according to the website. This acquisition comes ahead of the company's plans to expand nationally.

"LevelField's strategic approach presented a tremendous opportunity for the bank to expand beyond our local footprint and serve customers with shared interests across the nation," says Michael J. Busch, Burling Bank president and CEO. "Together, we will continue to provide superior service and demonstrate that we truly understand the expanding and unique needs of our customers. Additionally, through the carefully developed suite of products we can address our customers' interests in digital assets and introduce them to LevelField's safe, simple, and secure platform."

How this Houston innovator's tech is gearing up to impact EV charging, energy transition

houston innovators podcast episode 172

With more and more electric vehicles on the road, existing electrical grid infrastructure needs to be able to keep up. Houston-based Revterra has the technology to help.

"One of the challenges with electric vehicle adoption is we're going to need a lot of charging stations to quickly charge electric cars," Ben Jawdat, CEO and founder of Revterra, says on the Houston Innovators Podcast. "People are familiar with filling their gas tank in a few minutes, so an experience similar to that is what people are looking for."

To charge an EV in ten minutes is about 350 kilowatts of power, and, as Jawdat explains, if several of these charges are happening at the same time, it puts a tremendous strain on the electric grid. Building the infrastructure needed to support this type of charging would be a huge project, but Jawdat says he thought of a more turnkey solution.

Revterra created a kinetic energy storage system that enables rapid EV charging. The technology pulls from the grid, but at a slower, more manageable pace. Revterra's battery acts as an intermediary to store that energy until the consumer is ready to charge.

"It's an energy accumulator and a high-power energy discharger," Jawdat says, explaining that compared to an electrical chemical battery, which could be used to store energy for EVs, kinetic energy can be used more frequently and for faster charging.

Jawdat, who is a trained physicist with a PhD from the University of Houston and worked as a researcher at Rice University, says some of his challenges were receiving early funding and identifying customers willing to deploy his technology.

Last year, Revterra raised $6 million in a series A funding round. Norway’s Equinor Ventures led the round, with participation from Houston-based SCF Ventures. Previously, Revterra raised nearly $500,000 through a combination of angel investments and a National Science Foundation grant.

The funding has gone toward growing Revterra's team, including onboarding three new engineers with some jobs still open, Jawdat says. Additionally, Revterra is building out its new lab space and launching new pilot programs.

Ultimately, Revterra, an inaugural member of Greentown Houston, hopes to be a major player within the energy transition.

"We really want to be an enabling technology in the renewable energy transition," Jawdat says. "One part of that is facilitating the development of large-scale, high-power, fast-charging networks. But, beyond that, we see this technology as a potential solution in other areas related to the clean energy transition."

He shares more about what's next for Revterra on the podcast. Listen to the interview below — or wherever you stream your podcasts — and subscribe for weekly episodes.