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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2 Houston universities excel on 2026 list of best U.S. colleges

Best in Class

Two top-tier Houston universities have been inducted into a new "hall of fame" list of the best colleges in the U.S. for 2026.

Rice University and the University of Houston were both praised in The Princeton Review's "The Best 391 Colleges: 2026 Edition."

Released August 12, the comprehensive guide annually ranks the best universities across 50 categories based on a survey of 170,000 current college students. Survey questions cover topics such as a school's academics and administration, student quality of life, politics, campus life, city life, extracurricular opportunities, and social environment.

The Princeton Review did not numerically rank the schools overall, but it does report the top 25 schools (out of the total 391) for each of the 50 different categories. The report also clarifies that while schools did not pay to be included in the guide, they could pay for a "featured" designation. Neither Houston university paid to be featured on the list.

Rice University, Houston's most prestigious private institution, appeared in the overall 391 best colleges list, and it also appeared in the regional "Best Southwest" list, the "Best Value Colleges" list, and the "Colleges That Create Futures" list. Rice's overall quality and its academic integrity are what students say are its greatest strengths. Students are additionally encouraged to think creatively — and even unconventionally — about how to approach course assignments.

"There's also an outside-the-box thinking when it comes to assessments, like 'the option to make a 30 minute scientific podcast instead of taking the final,' explains one sophomore," the school's profile says. "This isn't unusual for first-years either; one notes that 'instead of doing a bunch of writing and essays, I was tasked with creating...a TED Talk, which really lit a creative flame in me.'"

Rice students can brag about attending a school with the seventh best college newspaper and the 10th best college dorms and quality of life out of all colleges nationwide. The university's financial aid is also the ninth best in the country.

Here's how Rice fared in other Princeton Review rankings:

  • No. 14 – Top 50 Best Value Private Colleges
  • No. 14 – Lots of Race/Class Interaction
  • No. 17 – Best College Radio Station
  • No. 18 – Top 20 Best Value Private Colleges without Financial Aid
  • No. 19 – Best Science Lab Facilities
  • No. 23 – Best-Run Colleges
  • No. 25 – Students Study the Most

Rice has recently earned praise in a separate 2026 ranking of the best universities in the world, and its MBA program scored highly in The Princeton Review's 2025 best business schools list.

University of Houston also appeared in The Princeton Review's "Best Value Colleges," "Best Southwest," "Green Colleges," and "Colleges That Create Futures" lists. Students at this university also benefit from having the No. 1 undergraduate entrepreneurship program in the nation.

"Whether you're in or out-of-state, students consider their school to be 'not very expensive for the quality of education you're getting,' and the constant improvements help 'you feel like your degree is appreciating in value over time along with the school itself," the university's profile says.

Here's how University of Houston performed in other rankings:

  • No. 20 – Students Love Their School Teams
  • No. 21 – Scotch and Soda, Hold the Scotch (this list measured schools based on "the use of hard liquor" as reported by student surveys)
  • No. 22 – Cancel the Keg (this list measured "how widely beer is used" at schools based on student survey results)
  • No. 22 – Pot's Not Hot (this list ranked colleges with the "least marijuana usage based on ratings from real students about the popularity of marijuana on campus")
  • No. 25 – Most Politically Moderate Students
  • No. 42 – Top 50 Best Value Public Colleges
Unfortunately, UH ranked No. 11 in The Princeton Review's ranking of schools where financial aid is "not so great." However, there is plenty else to appreciate about this high performing university.

Other Texas universities included in The Princeton Review are:

  • University of Texas at Austin
  • Southwestern University in Georgetown
  • Texas State University in San Marcos
  • Trinity University in San Antonio
  • Texas A&M University in College Station
  • Angelo State University in San Angelo
  • Baylor University in Waco
  • Texas Christian University in Fort Worth
  • Southern Methodist University in Dallas
  • The University of Texas at Dallas in Richardson
  • University of Dallas in Irving
  • Austin College in Sherman
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This article originally appeared on CultureMap.com.

Intuitive Machines partners with Houston college for workforce training

space training

Intuitive Machines, a Houston-based space technology, infrastructure and services company, has forged a partnership with San Jacinto College to develop a program for training workers to handle biopharmaceutical materials delivered to Earth on Intuitive Machines’ re-entry vehicle.

Intuitive Machines is working with biotech company Rhodium Scientific on the project. Rhodium, also based in Houston, is developing biomanufacturing payloads for Intuitive Machines’ re-entry vehicle.

“Delivering life-improving pharmaceuticals from orbit is only valuable with reliable recovery and processes on Earth,” Tim Crain, chief technology officer at Intuitive Machines, said in a news release. “That requires more than a spacecraft — it demands the workforce, facilities, and regulatory alignment to support safe, repeatable operations. San Jacinto College has the credibility and technical depth to make this vision a reality.”

San Jacinto College provides training certified by the National Institute for Bioprocessing Research and Training. Christopher Wild, assistant vice chancellor and vice president of biotechnology at San Jacinto College, said that with this certification and the college’s presence at Houston Spaceport, the school “is uniquely positioned to train the workforce needed (for) commercial space-based pharma recovery.”

The first-phase grant supporting Intuitive Machines’ Earth re-entry program will culminate in a full-scale mockup tailored to real payloads and use cases in early 2026.

Intuitive Machines said the collaborations with San Jacinto College and Rhodium “aim to align future landing infrastructure, research opportunities, and funding pathways that deliver lasting economic impact from space.”

Nominate top innovators for the 2025 Houston Innovation Awards by Aug. 31

Calling All Innovators

Editor's note: Houston innovators, this is your reminder that the nomination period for the 2025 Houston Innovation Awards closes on Sunday, August 31. Please provide your nominations for Houston's best and brightest innovators and innovative companies at at this link. Our panel of judges will review the nominees to determine the 2025 Houston Innovation Awards finalists and winners. Finalists will be named September 30, and winners will be revealed at our event on November 5.

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Calling all Houston innovators: The Houston Innovation Awards return this fall to celebrate the best and brightest in the Houston innovation ecosystem right now.

Presented by InnovationMap, the fifth annual Houston Innovation Awards will take place November 5 at TMC Helix Park.

The awards program will honor the top startups and innovators in Houston across 10 categories, and we're asking you to nominate the most deserving Houston innovators and innovative companies today.

This year's categories are:

  • Minority-founded Business, honoring an innovative startup founded or co-founded by BIPOC or LGBTQ+ representation.
  • Female-founded Business, honoring an innovative startup founded or co-founded by a woman.
  • Energy Transition Business, honoring an innovative startup providing a solution within renewables, climatetech, clean energy, alternative materials, circular economy, and beyond.
  • Health Tech Business, honoring an innovative startup within the health and medical technology sectors.
  • Deep Tech Business, honoring an innovative startup providing technology solutions based on substantial scientific or engineering challenges, including those in the AI, robotics, and space sectors.
  • Startup of the Year (People's Choice), honoring a startup celebrating a recent milestone or success. The winner will be selected by the community via an interactive voting experience.
  • Scaleup of the Year, honoring an innovative later-stage startup that's recently reached a significant milestone in company growth.
  • Incubator/Accelerator of the Year, honoring a local incubator or accelerator that is championing and fueling the growth of Houston startups.
  • Mentor of the Year, presented by Houston Community College, honoring an individual who dedicates their time and expertise to guide and support budding entrepreneurs.
  • Trailblazer, honoring an innovator who's made a lasting impact on the Houston innovation community.

Nominations may be made on behalf of yourself, your organization, and other leaders in the local innovation scene. The nomination period closes on August 31, so don't delay — nominate today at this link, or fill out the embedded form below.

Our panel of esteemed judges will review the nominations, and determine the finalists and winners. Finalists will be unveiled on September 30, and the 2025 Houston Innovation Awards winners will be announced live at our event on November 5.

Tickets will go on sale this fall. Stay tuned for that announcement, as well as more fanfare leading up to the 2025 Houston Innovation Awards.

Nominate now:

Interested in Innovation Awards sponsorship opportunities? Please contact sales@innovationmap.com.