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45 years ago, Carl Sagan debunked astrology in 2 minutes using twins and a newspaper

“Astrology suggests a dangerous fatalism.”

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Carl Sagan on astrology.

Astrology is the pseudoscientific study of the patterns in the stars and their alleged influence over individuals and history. It has existed as long as humans first gazed into the night sky, and it continues to fascinate people to this day. Currently, it's experiencing a renaissance with younger people after becoming a popular topic on social media.

“There’s some indication that cave art shows this idea that animals and things can be imbued with some kind of spirit form that then has an influence on you, and if you appease that spirit form, then you will have a successful hunt. That was taken over by the idea of divination, where you can actually look at things in nature and study them carefully, such as tea-leaf reading,” astronomer Sten Odenwald told Time.

astroloical chart, astrological sign, astrology, libra, stars, planets, diceAn astrological chart and divination dice.via Canva/Photos

Even though humanity’s understanding of the cosmos has made astrology appear rather crude and outdated, some people still swear by the power of Mercury in retrograde or the return of Saturn to determine the course of their lives. A recent YouGov poll found that 27% of Americans, including 37% of those under 30, believe that the position of the stars and planets influences their lives.

Although there’s something magical about having one's fate intertwined with the movement of celestial objects, it’s not a very logical way to go through life. In fact, Carl Sagan quickly disproved astrology in a 1980 episode of Cosmos: A Personal Journey. Sagan, the “Showman of Science,” is one of the world's greatest science communicators. At the time, Cosmos was seen by over 500 million people, making it the most-watched show in public television history.

- YouTubewww.youtube.com

Carl Sagan believed that astrology is dangerous.

“[Astrology] seems to lend a cosmic significance to the routine of our daily lives. It pretends to satisfy our longing to feel personally connected with the universe. Astrology suggests a dangerous fatalism. If our lives are controlled by a set of traffic signals in the sky. Why try to change anything?” Sagan asked.

How to disprove astrology

Sagan used two simple methods to disprove astrology. The first was by looking at competing astrological forecasts in two newspapers, the New York Post and the New York Daily News. The Post's forecast for Libra said that “compromise will help ease tension.” However, the forecast for Libra in the Daily News suggests the opposite: “Demand more of yourself.”

“It's interesting that these predictions are not predictions, they tell you what to do, they don't say what's going to happen,” Sagan said. “They're consciously designed to be so vague that it could apply to anybody, and they disagree with each other.”

Sagan shot more holes into astrology by noting that if he had a twin, born on the same day, nearly at the same time, with the exact same astrological sign, they could have very different destinies. In the case of twins, one may die at a very young age from a horseback accident, while another may live a long and prosperous life. Therefore, the astrological forecast would have to be incorrect for one of them. "If astrology were valid, how could we have such profoundly different fates?" Sagan asks.

carl saga, nasa, carl sagan moon, moon lander, moon mission, astronomyCarl Sagan with NASA technology.via NASA/Wikimedia Commons

Ultimately, Sagan believes that looking towards the planets to find out where our lives are headed is a shallow way of connecting with the universe when our real connection goes right to the core of our being. “The desire to be connected with the cosmos reflects a profound reality, for we are connected not in the trivial ways that the pseudoscience of astrology promises but in the deep ways,” Sagan said. But what is this deeper connection Sagan is alluding to? He has shown that humans are made of the most incredible substance in the cosmos: starstuff.

“The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff,” Sagan famously said.

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Shooting stars: What happens when astronauts poop in space?

Astronauts use the atmosphere to their advantage.

via Canva/Photos

A shooting star above a winter landscape.

Astronauts must undergo extensive training before they can enter space. They have to learn spacecraft operations, survival skills, robotics, physical fitness, how to walk in space, and emergency protocols in case something goes wrong. They also need extensive training on how to use the toilet.

How do astronauts go to the bathroom in zero gravity?

Astronaut Chris Hadfield, a former commander of the International Space Station (ISS), says that astronauts must learn to recognize that the urge to go feels different in zero gravity. “How do you know when you have to poop on earth? It's actually because of the weight of the poop inside you. Tells you, hey, it's time to poop,” Hadfield says. “Well, if you're weightless, then your body's not gonna tell you it's time to poop. So you almost have to learn this new sort of fullness symptom that tells you it's time to poop.”


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How to poop in Space #astronauts #space #poop #iss #internationalspacestation #astronaut

Hadfield goes onto explain the rather ingenious of fans in space station toilets that mimic gravity for you. "Taking the place of gravity to pull the poop into the toilet is airflow," Hadfield explains. The fans work to suck the waste down once it leaves the body (this goes for urine as well, notes Hadfield). Though an impressive workaround, Hadfield certainly appreciates the effects of gravity after returning to Earth since it makes it a lot easier to go poop. “You're counting on gravity, cause gravity is gonna pull it away from you,” Hadfield said. “And without gravity, even when you're done pooping, the the poops just gonna stay sort of sticking to you. So we wear a rubber glove. And sometimes you have to, like, physically separate the poop from your body.”

Thank goodness for gravity.

johnson space center, space toilet, bathroom space shuttle, houston texas, space, engineering, Space Shuttle toilet on display at the Johnson Space Center in Houston.via Svobdat/Wikimedia Commons

Using air instead of water to suck waste into a space toilet makes things a lot less messy, too. You don’t want to flush your urine and feces in zero gravity. That would be a horror show. Being in space also does strange things to your poop. When astronaut Scott Kelly returned home after spending a year aboard the ISS, researchers found that his gut microbiome changed significantly from those typically found on the ground. It took a few months after Kelly’s return to Earth for his gut to return to normal.

iss, international space station, space, nasa photos, its, solar arraysThe International Space Station.via NASA/Wikimedia Commons

Where does the poop go when astronauts use the bathroom in space?

When Kelly was on the ISS, the urine was transformed into reusable water aboard the space station. The feces, for which he produced over 180 pounds during his 340-day stay in space, is collected into bags and put on a small craft that is launched into space. Much like a shooting star or meteorite, the waste eventually burns up as it reenters the atmosphere, so you don’t have to worry about astronaut poop landing on the roof of your house.

Astronauts must be cautious about when and where they use the restroom while in space, so a diaper can be a valuable asset during their mission. There’s nowhere to go on a spacewalk, so astronauts wear diapers to avoid aborting their mission if nature calls 250 miles above the Earth's surface. They also wear a diaper during takeoffs and landings because it’s too dangerous to get up and walk around the cabin.

You have to master an incredible number of skills to be able to make it into space as an astronaut. You need to know science and engineering, but also possess a good sense of self. You must learn new ways of interacting with your body, and one of the most important values you can cultivate while exploring the final frontier is humility.

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Walking Alongside Martu: A journey with one of the world’s oldest living cultures

Pura’s inaugural impact collection honors both sacred traditions and sustainable futures.

James Roh
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In a world driven by speed, efficiency, and immediate results, it’s easy to forget that lasting change is built on trust. Real impact doesn’t come from rushing toward an end goal or measuring success through lofty metrics. It comes from falling in love with the problem, building a community around it, and sharing a vision for lasting transformation.

Pura, the smart home fragrance company that marries premium fragrance with innovative technology, recently launched its inaugural impact collection with K Farmer Dutjahn Foundation (KFDF) and Dutjahn Sandalwood Oils (DSO). The Pura x Dutjahn partnership began with a clear purpose: to source a sacred ingredient directly from its origin while honoring the land and the people who’ve cared for it. Our goal wasn’t simply to find sandalwood — it was to find a community and an ingredient that embody exceptional land stewardship, ethical harvesting, and transformative, community-led impact. After careful research and over three years of development, we saw an opportunity to secure a premium, luxurious ingredient while supporting a regenerative supply chain that invests in Indigenous-led education, economic opportunity, and land stewardship.

James Roh

Over the past several years, we’ve walked alongside Martu, an Indigenous tribe from the vast Western Australian desert. Martu are one of the oldest living cultures in the world, with a history spanning 60,000 years. As nomadic hunter-gatherers, they have unparalleled ecological knowledge, passed down through generations, making them the traditional custodians of the land. Their approach to sandalwood harvesting isn’t driven by market demand but by a deep respect for seasonal rhythms, land health, and cultural law. Their work adapts to the environment—whether it’s “sorry time,” when mourning pauses activities, or the harsh desert conditions that make travel and communication difficult. Martu operate on Martu time, a deliberate rhythm shaped by millennia of experience, far removed from the rapid-swipe, hyper-productive pace of Western systems.

Martu’s ecological knowledge isn’t documented in baseline reports. It’s lived, carried in stories, and practiced with rigor and respect for the changing needs of the ecosystems. True partnership means unlearning the typical approach. It means standing beside—not in front—and recognizing that the wisdom and leadership we need already exist within these communities. Our role isn’t to define the work, but to support it, protect it, and learn from it.

James Roh

Tonight, as I spoke with Chairman Clinton Farmer and the KFDF team about our focus for this piece, I learned that Clinton’s truck had broken down (again), leaving him to “limp” back to town from the desert at low speeds for hours and hours. He had been awake since 3:00 a.m. This is a common and costly setback, one that disrupts the harvest, demands days of driving, and brings real financial and emotional strain. These barriers are relentless and persistent, part of the harsh reality Clinton and his community face daily. It's easy for outsiders, detached from the reality on the ground, to impose rules, regulations, and demands from afar. Rather than continuing to impose, we need to truly partner with communities — equipping them with the resources to operate sustainably, avoid burnout, and protect the very land they love and care for. All while they endeavor to share these incredible, sacred ingredients with the world and build an economic engine for their people.

There is much to learn, but we are here to listen, adapt, and stay the course. The future we need will not be built in quarterly cycles. It will be built in trust, over time, together.

To learn more about the partnership and fragrances, visit Pura x Dutjahn.

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The 'world's slowest experiment,' going for nearly 100 years, is still endlessly fascinating

It takes nearly a decade for one drop of this liquid to fall.

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John Mainstone was the custodian of the Pitch Drop Experiment for 52 years.

Because we use water all the time, most of us have an intuitive sense of how long it takes a drop of water to form and fall. More viscous liquids, like oil or shampoo or honey, drop more slowly depending on how thick they are, which can vary depending on concentration, temperature and more. If you've ever tried pouring molasses, you know why it's used as a metaphor for something moving very slowly, but we can easily see a drop of any of those liquids form and fall in a matter of seconds.

But what about the most viscous substance in the world? How long does it take to form a falling drop? A few minutes? An hour? A day?

How about somewhere between 7 and 13 years?

pitch drop experiment, tar pitch, solid or liquid, physics, world's longest experimentPitch moves so slowly it can't be seen to be moving with the naked eye until it prepares to drop. Battery for size reference.John Mainstone/University of Queensland

The Pitch Drop Experiment began in 1927 with a scientist who had a hunch. Thomas Parnell, a physicist at the University of Queensland in Australia, believed that tar pitch, which appears to be a solid and shatters like glass when hit with a hammer at room temperature, is actually a liquid. So he set up an experiment that would become the longest-running—and the world's slowest—experiment on Earth to test his hypothesis.

Parnell poured molten pitch it into a funnel shaped container, then let it settle and cool for three years. That was just to get the experiment set up so it could begin. Then he opened a hole at the bottom of the funnel to see how long it would take for the pitch to ooze through it, form a droplet, and drop from its source.

It took eight years for the first drop to fall. Nine years for the second. Those were the only two drops Parnell was alive for before he passed away in 1948.

- YouTubewww.youtube.com

In total, there have been nine pitch drops in the University of Queensland experiment. The first seven drops fell between 7 and 9 years apart, but when air conditioning was added to the building after the seventh drop, the amount of time between drops increased significantly. The drops in 2000 and 2014 happened approximately 13 years after the preceding one. (The funnel is set up as a demonstration with no special environmental controls, so the seasons and conditions of the building can easily affect the flow of the pitch.)

The next drop is anticipated to fall sometime in the 2020s.

pitch drop experiment, tar pitch, solid or liquid, physics, world's longest experimentThe first seven drops fell around 8 years apart. Then the building got air conditioning and the intervals changed to around 13 years.RicHard-59

Though Parnell proved his hypothesis well before the first drop even fell, the experiment continued to help scientists study and measure the viscosity of tar pitch. The thickest liquid substance in the world, pitch is estimated to be 2 million times more viscous than honey and 20 billion times the viscosity of water. No wonder it takes so ridiculously long to drop.

One of the most interesting parts of the Pitch Drop Experiment is that in the no one has ever actually witnessed one of the drops falling at the Queensland site. The drops, ironically, happen rather quickly when they do finally happen, and every time there was some odd circumstance that kept anyone from seeing them take place.

The Queensland pitch drop funnel is no longer the only one in existence, however. In 2013, Trinity College in Dublin, Ireland, managed to capture its own pitch drop on camera. You can see how it looks as if nothing is happening right up until the final seconds when it falls.

- YouTubewww.youtube.com

Today, however, with the internet and modern technology, it's likely that many people will be able to witness the next drop when it happens. The University of Queensland has set up a livestream of the Pitch Drop Experiment, which you can access here, though watching the pitch move more slowly than the naked eye can detect is about as exciting as watching paint dry.

But one day, within a matter of seconds, it will drop, hopefully with some amount of predictability as to the approximate day at least. How many people are going to be watching a livestream for years, waiting for it to happen?

PoorJohn Mainstone was the custodian of the experiment for 52 years, from 1961 to 2013. Sadly, he never got to witness any of the five drops that took place during his tenure. Neither did Parnell himself with the two that took place while he was alive.

John Mainstone, pitch drop experiment, university of queensland, physicsJohn Mainstone, the second custodian of the Pitch Drop Experiment, with the funnel in 1990.John Mainstone, University of Queensland

Sometimes science is looks like an explosive chemical reaction and sometimes it's a long game of waiting and observing at the speed of nature. And when it comes to pitch dripping through a funnel, the speed of nature is about as slow as it gets.


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