Category: teaching

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Forbidden Love in the Pleistocene: When Homo sapiens Met the Neanderthals

It begins with a few suspicious snippets of DNA.

They sit quietly inside our chromosomes—genetic heirlooms from ancestors whose names have been forgotten and whose family photographs were never taken because photography would not be invented for another 50,000 years. Europeans and Asians commonly carry about 1–2 percent Neanderthal DNA. Some populations in Oceania possess an additional helping of Denisovan ancestry.

Clearly, something happened.

Officially, scientists call it archaic admixture. But let us dispense with the laboratory euphemisms. Our ancestors were sleeping with the neighbors.

These were the original fusion families—and one suspects they generated considerable gossip around the communal fire.

“Did you hear about Oona?”

“No.”

“She’s seeing a Neanderthal.”

“The one with the brow ridge?”

“They all have brow ridges, Mabel.”

Out of Africa—and Into an Awkward Reception

Early Homo sapiens did not simply leave Africa once in a single triumphant parade. There appear to have been earlier excursions into the Middle East and Eurasia, followed later by the major expansion—roughly 60,000 to 70,000 years ago—that produced most of the ancestry of people living outside Africa today.

So, in broad terms, we were out of Africa more than once. The first expeditions may have faded away or contributed little to later populations. The later travelers were more successful, although “successful” is a generous term for people crossing deserts on foot without maps, luggage, antibiotics or a decent airport lounge.

When Homo sapiens entered Neanderthal territory, they encountered people who had already survived hundreds of thousands of years of European winters. Neanderthals were powerfully built, technologically capable and remarkably well adapted to cold climates.

The newcomers were probably not greeted with gift baskets.

From the Neanderthal perspective, these skinny tropical immigrants must have looked poorly equipped:

“Look, Urg. More sapiens.”

“They’ll never last the winter.”

“They’re wearing shells as jewelry.”

“Pretentious.”

The Neanderthals were the hearty locals—the prehistoric equivalent of people who shovel snow in shorts. Homo sapiens, by comparison, arrived with narrower bodies, complicated social networks and an irritating tendency to keep moving into neighborhoods where nobody had invited them.

The First Culture War

It is tempting to imagine sapiens proudly unveiling their latest technological achievement.

“Behold—a finely shaped stone blade!”

The Neanderthal examined it.

“You spent all afternoon making that?”

“It has a symmetrical edge.”

“It’s a rock, Kevin.”

Both Neanderthals and modern humans made sophisticated tools. Neanderthals also used pigments, collected unusual objects and may have created symbolic markings or art of their own. The old caricature of the stupid, shambling caveman has not aged well.

Still, cultural rivalry must have been irresistible.

When sapiens began decorating caves with horses, bison and handprints, conservative Neanderthal critics may have complained that the work lacked realism.

“The bison’s legs are completely out of proportion.”

“It’s symbolic.”

“It’s rubbish. And now there’s ochre all over the wall.”

A Neanderthal father might have watched his daughter admire a sapiens artist and muttered, “He calls himself a painter, but he still lives in a cave.”

Love Across the Species Line

We do not know whether prehistoric groups disapproved of interbreeding. No Pleistocene advice columns survive, and archaeology has yet to uncover a stone tablet reading, “Over my dead body will you marry a Denisovan.”

Indeed, the word species becomes rather slippery here. Neanderthals, Denisovans and modern humans were distinct populations, but they could have fertile offspring. Whether we call them separate species, subspecies or humanity’s extremely distant regional cousins depends partly on how we define species.

Whatever terminology we choose, their DNA tells us the relationships occurred repeatedly.

The courtship process remains unknown.

Perhaps sapiens males impressed Neanderthal women with beads, music and long-distance trade networks. Perhaps Neanderthal males impressed sapiens women by lifting an entire elk without bending their knees.

One imagines the parental objections:

“He’s not our kind.”

“He’s thoughtful.”

“He has no chin.”

“That’s superficial.”

“He lives beyond the third glacier!”

“I love him.”

“Oh, wonderful. Mixed children. What will the mammoths say?”

Yet the children survived. Some had children of their own. Their genetic traces traveled through thousands of generations and now influence aspects of immunity, skin biology, metabolism and disease susceptibility.

Every family has secrets. Ours are encoded in base pairs.

The Denisovan Scandal

Denisovans are even more mysterious. We know them largely from DNA extracted from a few bones and teeth found in Asia. They left far fewer recognizable fossils than Neanderthals, yet their genetic legacy survives strongly in some populations, particularly in Papua New Guinea and other parts of Oceania.

Denisovan ancestry also contributed useful adaptations. One famous example is a version of the EPAS1 gene that helps Tibetans function at high altitude.

Thus, an ancient liaison with Denisovans eventually enabled people to live comfortably where sea-level visitors become breathless carrying a sandwich upstairs.

Evolution is nothing if not practical.

The Denisovans themselves had apparently interbred with even older, unidentified archaic humans—a “ghost population” that may have been related to Homo erectus or another ancient lineage.

This means Denisovans were criticizing their children’s romantic choices while concealing archaic entanglements of their own.

“You cannot marry a sapiens!”

“But Grandmother says your side of the family has erectus DNA.”

“Grandmother talks too much.”

We have no direct genetic proof that Homo erectus interbred with modern humans. But genetic studies suggest that some Denisovan ancestors mated with a very ancient human lineage. If that lineage was Homo erectus or something similar, then the prehistoric family tree was less a tree than a hedge after several glasses of wine.

Homo erectus: The Original Wanderer

Long before modern humans began congratulating themselves for leaving Africa, Homo erectus had already done it—perhaps nearly two million years ago.

They spread across enormous distances and survived far longer than our species has existed so far. If longevity were the measure of evolutionary success, Homo erectus could look at Homo sapiens and say, “Call me when you’ve made it past the million-year mark.”

Whether erectus engaged in genetic unfaithfulness with later human groups remains uncertain. But considering the record of every human population for which we possess DNA, the safest conclusion is that when two hominin groups met, they sometimes fought, sometimes exchanged technology and occasionally exchanged phone numbers—metaphorically speaking, since the Pleistocene cellular network was terrible.

The Shame of the Fusion Family

Did mixed families experience prejudice? Possibly, but we cannot know. Small hunter-gatherer groups depended heavily on cooperation, and outsiders could be regarded as competitors, allies, trading partners or potential spouses. A newcomer’s ancestry probably mattered less than whether he could find water, butcher an animal and refrain from attracting hyenas.

Still, one can imagine the social discomfort.

At the annual solstice gathering, a mixed sapiens-Neanderthal family arrives.

The children are robust, clever and slightly hairier than average.

Everyone tries not to stare.

A sapiens aunt whispers, “They have his brow ridge.”

The Neanderthal grandmother replies, “At least they have shoulders.”

Then the children demonstrate a better hunting technique, decorate the cave and survive the next epidemic. Within a few generations, everybody has forgotten why the match was controversial.

That is the great joke hidden in our DNA: the supposedly improper unions were not evolutionary mistakes. Some produced descendants who were better adapted to local diseases, climates and environments.

The scandal became an advantage.

We Are All the Result of Questionable Decisions

Eventually, Neanderthals disappeared as a distinct population. Denisovans vanished from the visible archaeological record. Other human lineages faded as well. Some were displaced, some absorbed and some probably succumbed to combinations of climate change, small population size, competition and plain bad luck.

But they did not disappear completely.

They survive inside us—in immune responses, skin traits, metabolic quirks and tiny stretches of chromosomes passed down from lovers who met tens of thousands of years ago.

We like to tell human evolution as a heroic story in which Homo sapiens marched out of Africa, defeated inferior rivals and inherited the Earth through superior intelligence.

The DNA tells a messier and much more entertaining story.

We wandered out of Africa in multiple waves. We met people who looked different from us. We competed with them, borrowed from them and had children with them. Some families were undoubtedly appalled. Some neighbors probably gossiped. A few fathers sat silently in the corner sharpening hand axes.

And yet the children endured.

So the next time someone complains about intermarriage, cultural mixing or newcomers entering the neighborhood, remind them that human beings have been upsetting the in-laws since the Ice Age.

Then show them their genome.

There is probably a Neanderthal in it, quietly raising one enormous eyebrow.

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I Went Back to my Kindergarten Class of 1958– Here is What I Told Them

Show and Tell, 67 Years Later

I arrive in Whitestone, Queens, in the soft, milk-glass light of 1958. The air smells faintly of chalk and floor wax. The sidewalks are narrower, the cars longer, the future quieter. I push open the classroom door and there you all are—knees scabbed, collars starched, haircuts obedient to gravity and mothers. Mrs. LaPenna stands watch, ruler nearby, smile doing most of the work.

You look up at me as if I’m a substitute teacher who took a wrong turn off the Whitestone Expressway. I tell you I’m one of you—just borrowed from a later inning of the same game. I’m here on a time pass from 2025, and I don’t have long.

I start with the easy truths.

“First,” I say, “you’re growing up in a good moment. The Dodgers have left Brooklyn, which hurts, but the Yankees are still a juggernaut. Elvis is on the radio. Ike is in the White House. Polio is on the ropes. Milk comes in bottles and your parents still believe tomorrow will be better because it usually is.”

A few of you grin. One kid in the front row adjusts his bow tie like it’s armor.

“Second,” I say, “hold onto this room. You won’t know it now, but classrooms like this—blackboard dust, wooden desks, a teacher who knows your full name—are where the country learns how to argue without fighting. You’ll need that skill.”

I tell you what’s coming, gently.

“There will be a man on television named Kennedy who makes politics look young. There will be marches where people insist—out loud—that America live up to its own handwriting. There will be a war you’ll see every night at dinner. Some of you will go. Some of you will protest. Most of you will just try to make sense of it all.”

You fidget. Big words for small shoes.

“So here’s the advice,” I say, and I lean in because advice should never be shouted.

“Be curious longer than is comfortable. Read beyond the assignment. Learn how things work—your body, a carburetor, a balance sheet, a sentence. When the world tells you to pick a side fast, slow down. Speed makes noise; understanding makes progress.”

I point to the windows. “Neighborhoods change. Whitestone will still be here, but it will look different. That’s not a loss—it’s a relay. You’ll carry what matters and pass it on.”

I pause, then add the part I didn’t know in kindergarten.

“You will fail at things you’re good at and succeed at things you never planned. That’s not hypocrisy—it’s growth. Be kind to yourself when the map gets smudged.”

Someone asks about the future—always the future.

I smile. “In 2025, you’ll carry a small rectangle in your pocket that knows almost everything. It will be miraculous and distracting. Use it to learn, not to disappear. And when it tells you the world is on fire, remember this room. Remember how a group of five-year-olds once sat still long enough to listen.”

Mrs. LaPenna clears her throat—the bell is coming.

“One more thing,” I say. “Call your parents more than you think you should. Thank teachers while you can. Save a photograph like this and look at it when you’re unsure who you are. You’re in here. So is everyone you’ll ever be.”

The bell rings. Chairs scrape. Time tightens.

As I step back into 2025, the chalk dust follows me for a second, then settles. I carry it with me—the proof that before the headlines and the hindsight, before the decades did what decades do, there was a room in Whitestone where the future sat cross-legged and waited its turn to speak.

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Transportation as a Gateway to Learning—From Subways to Skies

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Early Fascination as a Pathway to Discovery

Some kids memorize baseball stats. Others can name every dinosaur from Allosaurus to Zuniceratops. I was the kid who memorized the New York City subway map.

Four hundred eighty-six track miles, a tangle of lines more intricate than any anatomy chart, and 472 stations—each with its own personality. I used to sit with that map the way other kids sat with comic books. The G’s lonely green line, the A stretching heroically from Inwood to the ocean breeze of the Rockaways, the way the 4 and 5 shadow each other before peeling off like old friends heading to different boroughs. It wasn’t just a system of rails; it was a world of possibility.

Funny thing is, I now have a grandson with the same spark—except his passion lives on the streets and in the skies. At four, he stands on the curb like a miniature car sommelier, announcing make, model, and year before most adults could even identify the color. He studies maps like treasure charts, and when a plane crosses his field of vision, he looks up as if receiving a transmission from some aeronautical muse. He’s never been to San Diego—but when he finally visits, he’ll find it a transportation playground.

How Transportation Curiosity Shapes Learning

There’s something powerful about that kind of early fascination. People think it’s a hobby. But really, it’s a honing mechanism. When a child becomes obsessed with the mechanics of how things move—cars, buses, trains, planes—they’re not just naming machines. They’re building neural circuitry for attention, pattern recognition, systems thinking. They’re learning to follow a thread from point A to point B, and—without realizing it—training themselves for the long game: the ability to learn deeply, persistently, joyfully.

Transportation has always been more than conveyance. It’s a metaphor for growth. Anything that takes you from one place to another reminds you that there are other places, other ideas, other horizons waiting. Whether it’s a subway snaking under Manhattan or a plane banking over Mission Bay, movement awakens possibility.

The journey itself becomes a teacher.

A Few Stops of NYC Subway Trivia

The New York City subway—my first great teacher—remains a marvel. A few favorite bits of trivia:

  • The A train still holds the title for the longest uninterrupted ride in the system—over 32 miles from tip to sea.
  • Times Square is the busiest station, but the deepest is 191st Street in Washington Heights, sitting 180 feet below ground.
  • The 6 train still makes the elegant “City Hall loop,” passing through a hidden 1904 station closed since 1945.
  • And Fulton Center is one of the few places where more than nine different services intersect, creating a kind of transit symphony.

Maps, tracks, transfers—they were my first textbook.

A Balcony Classroom Awaits

Today, my vantage point is different. From a condo on 6th Avenue beside Balboa Park in San Diego, cars glide past in a steady parade. And every few minutes, a plane descends toward the airport, banking low enough to cast a brief shadow across the street. It’s a living exhibit in motion: automotive, aerial, and constant.

Someday, when my grandson finally visits San Diego, he’ll sit on that balcony for the first time. He’ll watch the cars flow by and begin identifying each one with the effortless precision he’s already mastered. He’ll look skyward and recognize the aircraft type, the engines, maybe even its probable origin and destination.

And from that mosaic of motion, he’ll continue his own journey—moving toward new ideas, new abilities, new horizons.

Because transportation, at its core, is a promise:

that where you begin is never where you have to end.

Sometimes all it takes is a subway map, a passing car, or the shadow of a jet to set a lifelong journey in motion.

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Golden Teachers: The Ones Who Shaped Us

There are people who pass through our lives and leave behind only a vague memory. And then there are teachers.

Teachers are the architects of our minds, the engineers of our values, the subtle sculptors of who we become. Their lessons go far beyond the blackboard—or these days, the touchscreen. While artificial intelligence may assist in learning, it will never replace the magic of chalk dust, a well-timed joke in a lecture, or the moment a teacher sees something in you before you ever see it in yourself.

My own journey through education is dotted with unforgettable figures who each gave me something I carry to this day.

Mr. Axelrod – 6th Grade, New York

He taught more than spelling and long division. Mr. Axelrod taught life. I remember one lesson that would never be in a textbook: “If you’re in a fight, throw the first punch.” Now, before you gasp, understand—this wasn’t about violence. It was about courage. About taking initiative. About standing up when you needed to. It was his way of saying, “Don’t let life back you into a corner.”

But Mr. Axelrod’s influence extended beyond the classroom. He was the orchestrator of student power at PS 209. He controlled and delegated the coveted positions of crossing guards—our law enforcement—and the elite slide and motion picture crews who operated the school’s visual media for assemblies. We were, to our minds, the penultimate intelligentsia—just one rung below Mrs. Pompa’s gifted “1” class. But looking back, I came to see that Mr. Axelrod gave us something perhaps more profound than gifted designation: he gave us influence. He showed us the power of controlling law enforcement and the narrative, even in the microcosm of an elementary school. A lesson in civics disguised as a privilege

Mrs. Rogart – 10th Grade Geometry

Geometry came alive in her classroom—truly alive, with chalk fragments flying in arcs that rivaled any parabolic graph. She attacked the blackboard with energy, hair in motion, proofs tumbling out until she capped it all off with an emphatic, sweeping “Q.E.D.”—which she translated as “Quite Easily Done.” With her, Euclid had flair. She made logic feel like art.

Mr. Barash – High School Social Studies

He didn’t just teach geography or history—he taught us how to think. He challenged us to look at the world with a geopolitical lens before most of us could spell “geopolitical.” He made us understand the causes behind the causes, the story behind the headline. It wasn’t about memorizing; it was about seeing.

Dr. Smith – College Biology

Now here’s a man who gave the phrase “learning in a bar” a good name. His office was the Rathskeller, a dimly lit pub in the bowels of the student union. There, over locally brewed Buffalo beer, he spun tales of fruit fly taxonomy that somehow made us want to memorize Latin names. He humanized science. He made it social, even fun.

Dr. Bugelski – Educational Psychology

It’s been over five decades, but I can still recite his lectures. That’s how vivid his theatrical delivery on learning and memory was. He didn’t just teach psychology—he performed it. He didn’t just explain the theories of learning—he embodied them. In a strange way, he implanted his lessons permanently in our neural networks.

Dr. Berman – Pharmacology, Medical School

He taught us the music of medicine. With cadence and rhythm, he embedded the pharmacopoeia into our green med student brains. We didn’t just memorize drugs—we felt them. His lessons were like a drumbeat: precise, repetitive, unforgettable.

Dr. Sam Rapaport – Hematology

Dr. Rapaport was the kind of physician we all aspired to be. A legendary hematologist with encyclopedic knowledge, yet he never lost his kindness. At the bedside, he modeled compassion with every word and gesture. His brilliance was exceeded only by his humility. I spent my career trying to emulate the grace he brought into every room.

Teachers like these are irreplaceable. Their impact is timeless.

Yes, AI may write essays, solve equations, or simulate patient encounters. But it can’t throw chalk with reckless joy. It can’t wink when you finally grasp a hard concept. It doesn’t pour wisdom into a dark corner of a campus pub. And it surely doesn’t leave behind the lasting rhythm of a mentor’s voice echoing across the decades.

Teachers are golden. Their value isn’t in their output—it’s in their humanity.

We revere them because they gave us more than facts.
They gave us ourselves.