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The most supermassive monsters in space: black holes. Swirling vortexes that nothing—not even light—can hope to escape from if it strays just a little too close. And if that wasn't enough, they're completely invisible.

They're some of the most bizarre objects in our universe—a favorite source of fascination among astronomers and space enthusiasts alike. Is it because we still understand so little about them? Or is it for the potential they hold at their core?

What's the anatomy of a black hole? Are they hiding the true secret of the singularity? At the point where time, space, and gravity break down—could they hold pathways to other universes? And if so, could we ever travel through one?

An interstellar invader has arrived in our solar system—again.

But if you thought 1I/Oumuamua was strange, this one is on a new level.

This summer, a NASA survey telescope caught our first-ever glimpse of an object that defies explanation, one that had quietly snuck into our celestial backyard, unseen. Since then, astronomers, news headlines, and people around the world have all been asking one question:

What is 3I/ATLAS?

Our best eyes in space have been scrambling to get a closer look as it transforms before our eyes, and what we've seen so far is raising more questions than answers.

What's really going on with 3I/ATLAS and its seven anomalies? Is it just a unique space rock from far, far away? Or do its bizarre trajectory, staggering speed, odd chemical makeup, and much more hint at extraterrestrial origins?

What might happen with it now performing a month-long disappearing act behind our sun? Plus, why have cultures feared comets for millennia? And could a NASA-funded project one day convert asteroids into spaceships?

Loneliness—in the middle of a crowd, or in a room full of friends. Is it all in your head? And what happens when it doesn't go away?

People say we forgot how to talk to each other during the COVID era—but is that all there is to it? What happened to make it so bad that health authorities now call it an epidemic?

What's really happening in the brain? Is the secret hidden in our genetic code? Do some people feel the weight of loneliness more than others? Have smartphones, social media, and dating apps connected people, or separated them? What's the real purpose of an emotion that feels so terrible? Is it just an inevitable part of being human? Or could it be a lost secret to becoming the best versions of ourselves?

The extraordinary human brain. The silent driver keeping our bodies running, and the reason we can think, feel, and remember. But when the brain gets tired and illness sets in—we lose ourselves. That is, until the final moment, when it all comes flooding back: memories, life force, and for some, supernatural experiences.

Terminal lucidity, or the end-of-life surge—it's the medical anomaly that's been baffling doctors for centuries.

What really happens inside the brain as we enter our final moments? Does life really flash before your eyes? What's behind this last hurrah—in the brain, and in nature? And what can we learn from the meeting point of neuroscience, near-death experiences, and a 2,000-year-old myth about saying goodbye?

In this episode, enter the Codex Legendarium for a closer look at: terminal lucidity, paradoxical lucidity, dementia and brain diseases, the neuroscience of death and near-death, types of brain waves and how they work, memory, life flashing before your eyes, supernatural experiences, Plato's Myth of Er, veridical near death experiences, the roles of serotonin and DMT in the brain, the pineal gland, the powerful brain waves of spiritual practitioners and meditators, and much more.

Autumn has arrived—and so have days filled with fall foliage, family feasts, a crisp chill in the air, and pumpkins galore.

The numbers say it's the favorite time of year for most Americans, and many others around the world. But aside from the warmth of Thanksgiving and the nostalgia of going back to school, fall is also tied to things that aren't warm or comforting at all. Works of art and cultures around the world call it the start of the "dark half" of the year.

Why do so many people eagerly await the time of year known for seasonal depression and Melancholia? What's the real secret behind the changing of the leaves? Is there something deeper that resonates with us, beyond nostalgia and its psychology?

And, just for fun, how old is the pumpkin spice latte, really?

When was the last time you saw a firefly?

For many of us, thousands of dazzling lights set the warm summer nights of our childhoods ablaze. But in recent years, the almost magical flickering has dimmed and virtually disappeared—and hardly anyone has noticed.

What really happened to the lightning bugs? What makes us remember to look for them? Why does almost every culture in the world have legends and stories highlighting their magic? And what does it say about our society that a symbol of childlike curiosity and wonder has almost vanished, quietly and without a trace?

Science says no matter how good medicine becomes, the human body has a hard age limit: somewhere between 120 and 150 years. But for a select few, even that may not be enough.

Two world leaders recently got caught talking about immortality, and now discussions about biohacking are making headlines.

What's really happening inside secret military labs created to lengthen the lives of the ultra-elite? How does it compare to life inside the world's mysteries Blue Zones, like Okinawa, Japan, where residents live for over a century with ease? And what can we learn from stories about mythical figures who lived for hundreds of years, or longer?

Is the world ready for the return of the dinosaurs?

Biotech companies are celebrating milestones in de-extinction projects, and cutting-edge tools like gene editing are opening up possibilities that, not so long ago, were beyond our wildest dreams.

The Jurassic Park movies have been stoking imagination, adrenaline, and adventure for 30 years—and this summer, dinosaurs returned to the silver screen.

How much did the movies get right? Could we really meet a woolly mammoth one day soon? And if we did—how would animals that thrived so far in the past fit into today's world? Or could they?

A giant planet could be lurking in the outer reaches of our solar system, hiding in the shadows just out of view of our telescopes. But maybe not for much longer.

It's a mystery that has captivated star watchers for nearly 125 years. The famed Planet X—or Planet 9—depending on who you ask.

Generations have searched for it, intrigued by peculiar planetary orbits in deep space that shouldn't be happening unless something big is out there, stirring up trouble. The hunt has uncovered an entirely different planet, and a zone so strange in the outer reaches of our solar system that crossing it is like falling off a cliff.

Is Planet X real? Why is the history of an unconfirmed space giant tied to the rejected 9th planet, Pluto? Why is there a ring around our solar system that's virtually devoid of celestial bodies? And what if there is something out there, but it isn't a planet?

Now, a brand new, cutting-edge telescope might just be able to find out.

There are some seriously weird things happening in space right now, and astronomers have no idea why.

Celestial objects sending out beams of mismatched radiation, zombie stars rotating post-mortem, celestial lighthouse beacons sending out signals, explosions powerful enough to rival the dawn of the cosmos, and a "space roar" resonating from the earliest parts of our universe.

Where is all that energy coming from? While astronomers are wondering how any of it is even possible, one mathematician from 2,500 years ago has a theory: there's a cosmic symphony happening in our universe—we just can't hear it.

Is space really as silent as we think? If it is, why have NASA probes been hearing the "sounds" of deep space? What really is "the Music of the Spheres"? And can we learn to hear it?