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5 Signs Humans Are Still Evolving

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Getty Images/Hulton Archive

When we think of human evolution, our minds wander back to the thousands of years it took natural selection to produce the modern-day man. But are we still changing as a species, even today? New research suggests that, despite modern technology and industrialization, humans continue to evolve. "It is a common misunderstanding that evolution took place a long time ago, and that to understand ourselves we must look back to the hunter-gatherer days of humans," says Dr. Virpi Lummaa from the University of Sheffield's department of animal and plant sciences.

But not only are we still evolving, we're doing so even faster than before. In the last 10,000 years, the pace of our evolution has sped up 100 times, creating more mutations in our genes, and more natural selections from those mutations. Here are some clues that show humans are continuing to evolve.

1. We Drink Milk

Historically, the gene that regulated a human's ability to digest lactose shut down as they were weaned off of their mother's breast milk. But when we began domesticating cows, sheep and goats, being able to drink milk became a nutritionally advantageous quality, and people with the genetic mutation that allowed them to digest lactose were better able to propagate their genes.

A 2006 study suggests this tolerance for lactose was still developing as early as 3,000 years ago in East Africa. That genetic mutation for digesting milk is now carried by more than 95 percent of Northern European descendants.

2. We're Losing Our Wisdom Teeth

Our ancestors had much bigger jaws than we do, which helped them chew a tough diet of roots, nuts and leaves. And what meat they ate they tore apart with their teeth, all of which led to worn down chompers that needed replacing. Enter the wisdom teeth: A third set of molars is believed to be the evolutionary answer to accomodate our ancestors' eating habits.

Today, we have utensils to cut our food. Our meals are softer and easier to chew, and our jaws are much smaller as a result, which is why wisdom teeth are often impacted when they come in — there just isn't room for them. Like the appendix, wisdom teeth have become vestigial organs. One estimate says 35 percent of the population is born without wisdom teeth, and some say they will disappear altogether.

3. We're Resisting Diseases

In 2007, a group of researchers looking for signs of recent evolution uncovered 1,800 genes that have only become prevalent in humans in the last 40,000 years, many of which are devoted to fighting infectious diseases like malaria. More than a dozen new genetic variants for fighting malaria are spreading rapidly among Africans. Another study found that natural selection has favored city-dwellers. Living in cities has produced a genetic variant that allows us to be more resistant to diseases like tuberculosis and leprosy. "This seems to be an elegant example of evolution in action," says Dr. Ian Barnes from the School of Biological Sciences at Royal Holloway. "It flags up the importance of a very recent aspect of our evolution as a species, the development of cities as a selective force."

4. Our Brains Are Shrinking

While we may like to believe our big brains make us smarter than the rest of the animal world, our brains have actually been shrinking over the last 30,000 years. The average volume of the human brain has decreased from 1,500 cubic centimeters to 1,350 cubic centimeters, which is equivalent to a chunk the size of a tennis ball.

There are several different conclusions as to why this is: One group of researchers suspects our shrinking brains mean we are in fact getting dumber. Historically, brain size decreased as societies became larger and more complex, suggesting that the safety net of modern society negated the correlation between intelligence and survival. But another, more encouraging theory says our brains are shrinking not because we're getting dumber, but because smaller brains are more efficient. This theory suggests that, as they shrink, our brains are being rewired to work faster but take up less room. There's also a theory that smaller brains are an evolutionary advantage because they make us less aggressive beings, allowing us to work together to solve problems, rather than tear each other to shreds.

5. We Have Blue Eyes

Originally, we all had brown eyes. But about 10,000 years ago, someone who lived near the Black Sea developed a genetic mutation that turned brown eyes blue. While the reason blue eyes have persisted remains a bit of a mystery, one theory is that they act as a sort of paternity test. “There is strong evolutionary pressure for a man not to invest his paternal resources in another man’s child,” says the lead author of a study on the development of our baby blues. Because it is virtually impossible for two blue-eyed mates to create a brown-eyed baby, our blue-eyed male ancestors may have sought out blue-eyed mates as a way of ensuring fidelity. This would partially explain why, in a recent study, blue-eyed men rated blue-eyed women as more attractive compared to brown-eyed women, whereas females and brown-eyed men expressed no preference.

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15 Heartwarming Facts About Mister Rogers
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Though Mister Rogers' Neighborhood premiered 50 years ago, Fred Rogers remains an icon of kindness for the ages. An innovator of children’s television, his salt-of-the-earth demeanor and genuinely gentle nature taught a generation of kids the value of kindness. In celebration of the groundbreaking children's series' 50th anniversary, here are 15 things you might not have known about everyone’s favorite “neighbor.”

1. HE WAS BULLIED AS A CHILD.

According to Benjamin Wagner, who directed the 2010 documentary Mister Rogers & Me—and was, in fact, Rogers’s neighbor on Nantucket—Rogers was overweight and shy as a child, and often taunted by his classmates when he walked home from school. “I used to cry to myself when I was alone,” Rogers said. “And I would cry through my fingers and make up songs on the piano.” It was this experience that led Rogers to want to look below the surface of everyone he met to what he called the “essential invisible” within them.

2. HE WAS AN ORDAINED MINISTER.

Rogers was an ordained minister and, as such, a man of tremendous faith who preached tolerance wherever he went. When Amy Melder, a six-year-old Christian viewer, sent Rogers a drawing she made for him with a letter that promised “he was going to heaven,” Rogers wrote back to his young fan:

“You told me that you have accepted Jesus as your Savior. It means a lot to me to know that. And, I appreciated the scripture verse that you sent. I am an ordained Presbyterian minister, and I want you to know that Jesus is important to me, too. I hope that God’s love and peace come through my work on Mister Rogers’ Neighborhood.”

3. HE RESPONDED TO ALL HIS FAN MAIL.

Responding to fan mail was part of Rogers’s very regimented daily routine, which began at 5 a.m. with a prayer and included time for studying, writing, making phone calls, swimming, weighing himself, and responding to every fan who had taken the time to reach out to him.

“He respected the kids who wrote [those letters],” Heather Arnet, an assistant on Mister Rogers’ Neighborhood, told the Pittsburgh Post-Gazette in 2005. “He never thought about throwing out a drawing or letter. They were sacred."

According to Arnet, the fan mail he received wasn’t just a bunch of young kids gushing to their idol. Kids would tell Rogers about a pet or family member who died, or other issues with which they were grappling. “No child ever received a form letter from Mister Rogers," Arnet said, noting that he received between 50 and 100 letters per day.

4. ANIMALS LOVED HIM AS MUCH AS PEOPLE DID.

It wasn’t just kids and their parents who loved Mister Rogers. Koko, the Stanford-educated gorilla who understands 2000 English words and can also converse in American Sign Language, was an avid Mister Rogers’ Neighborhood watcher, too. When Rogers visited her, she immediately gave him a hug—and took his shoes off.

5. HE WAS AN ACCOMPLISHED MUSICIAN.

Though Rogers began his education in the Ivy League, at Dartmouth, he transferred to Rollins College following his freshman year in order to pursue a degree in music (he graduated Magna cum laude). In addition to being a talented piano player, he was also a wonderful songwriter and wrote all the songs for Mister Rogers' Neighborhood—plus hundreds more.

6. HIS INTEREST IN TELEVISION WAS BORN OUT OF A DISDAIN FOR THE MEDIUM.

Rogers’s decision to enter into the television world wasn’t out of a passion for the medium—far from it. "When I first saw children's television, I thought it was perfectly horrible," Rogers told Pittsburgh Magazine. "And I thought there was some way of using this fabulous medium to be of nurture to those who would watch and listen."

7. KIDS WHO WATCHED MISTER ROGERS’ NEIGHBORHOOD RETAINED MORE THAN THOSE WHO WATCHED SESAME STREET.

A Yale study pitted fans of Sesame Street against Mister Rogers’ Neighborhood watchers and found that kids who watched Mister Rogers tended to remember more of the story lines, and had a much higher “tolerance of delay,” meaning they were more patient.

8. ROGERS’S MOM KNIT ALL OF HIS SWEATERS.

If watching an episode of Mister Rogers’ Neighborhood gives you sweater envy, we’ve got bad news: You’d never be able to find his sweaters in a store. All of those comfy-looking cardigans were knitted by Fred’s mom, Nancy. In an interview with the Archive of American Television, Rogers explained how his mother would knit sweaters for all of her loved ones every year as Christmas gifts. “And so until she died, those zippered sweaters I wear on the Neighborhood were all made by my mother,” he explained.

9. HE WAS COLORBLIND.

Those brightly colored sweaters were a trademark of Mister Rogers’ Neighborhood, but the colorblind host might not have always noticed. In a 2003 article, just a few days after his passing, the Pittsburgh Post-Gazette wrote that:

Among the forgotten details about Fred Rogers is that he was so colorblind he could not distinguish between tomato soup and pea soup.

He liked both, but at lunch one day 50 years ago, he asked his television partner Josie Carey to taste it for him and tell him which it was.

Why did he need her to do this, Carey asked him. Rogers liked both, so why not just dip in?

"If it's tomato soup, I'll put sugar in it," he told her.

10. HE WORE SNEAKERS AS A PRODUCTION CONSIDERATION.

According to Wagner, Rogers’s decision to change into sneakers for each episode of Mister Rogers’ Neighborhood was about production, not comfort. “His trademark sneakers were born when he found them to be quieter than his dress shoes as he moved about the set,” wrote Wagner.

11. MICHAEL KEATON GOT HIS START ON THE SHOW.

Oscar-nominated actor Michael Keaton's first job was as a stagehand on Mister Rogers' Neighborhood, manning Picture, Picture, and appearing as Purple Panda.

12. ROGERS GAVE GEORGE ROMERO HIS FIRST PAYING GIG, TOO.

It's hard to imagine a gentle, soft-spoken, children's education advocate like Rogers sitting down to enjoy a gory, violent zombie movie like Dawn of the Dead, but it actually aligns perfectly with Rogers's brand of thoughtfulness. He checked out the horror flick to show his support for then-up-and-coming filmmaker George Romero, whose first paying job was with everyone's favorite neighbor.

“Fred was the first guy who trusted me enough to hire me to actually shoot film,” Romero said. As a young man just out of college, Romero honed his filmmaking skills making a series of short segments for Mister Rogers’ Neighborhood, creating a dozen or so titles such as “How Lightbulbs Are Made” and “Mr. Rogers Gets a Tonsillectomy.” The zombie king, who passed away in 2017, considered the latter his first big production, shot in a working hospital: “I still joke that 'Mr. Rogers Gets a Tonsillectomy' is the scariest film I’ve ever made. What I really mean is that I was scared sh*tless while I was trying to pull it off.”

13. ROGERS HELPED SAVE PUBLIC TELEVISION.

In 1969, Rogers—who was relatively unknown at the time—went before the Senate to plead for a $20 million grant for public broadcasting, which had been proposed by President Johnson but was in danger of being sliced in half by Richard Nixon. His passionate plea about how television had the potential to turn kids into productive citizens worked; instead of cutting the budget, funding for public TV increased from $9 million to $22 million.

14. HE ALSO SAVED THE VCR.

Years later, Rogers also managed to convince the Supreme Court that using VCRs to record TV shows at home shouldn’t be considered a form of copyright infringement (which was the argument of some in this contentious debate). Rogers argued that recording a program like his allowed working parents to sit down with their children and watch shows as a family. Again, he was convincing.

15. ONE OF HIS SWEATERS WAS DONATED TO THE SMITHSONIAN.

In 1984, Rogers donated one of his iconic sweaters to the Smithsonian’s National Museum of American History.

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5 Things You Might Not Know About Ansel Adams

You probably know Ansel Adams—who was born on February 20, 1902—as the man who helped promote the National Park Service through his magnificent photographs. But there was a lot more to the shutterbug than his iconic, black-and-white vistas. Here are five lesser-known facts about the celebrated photographer.

1. AN EARTHQUAKE LED TO HIS DISTINCTIVE NOSE.

Adams was a four-year-old tot when the 1906 San Francisco earthquake struck his hometown. Although the boy managed to escape injury during the quake itself, an aftershock threw him face-first into a garden wall, breaking his nose. According to a 1979 interview with TIME, Adams said that doctors told his parents that it would be best to fix the nose when the boy matured. He joked, "But of course I never did mature, so I still have the nose." The nose became Adams' most striking physical feature. His buddy Cedric Wright liked to refer to Adams' honker as his "earthquake nose.

2. HE ALMOST BECAME A PIANIST.

Adams was an energetic, inattentive student, and that trait coupled with a possible case of dyslexia earned him the heave-ho from private schools. It was clear, however, that he was a sharp boy—when motivated.

When Adams was just 12 years old, he taught himself to play the piano and read music, and he quickly showed a great aptitude for it. For nearly a dozen years, Adams focused intensely on his piano training. He was still playful—he would end performances by jumping up and sitting on his piano—but he took his musical education seriously. Adams ultimately devoted over a decade to his study, but he eventually came to the realization that his hands simply weren't big enough for him to become a professional concert pianist. He decided to leave the keys for the camera after meeting photographer Paul Strand, much to his family's dismay.

3. HE HELPED CREATE A NATIONAL PARK.

If you've ever enjoyed Kings Canyon National Park in California, tip your cap to Adams. In the 1930s Adams took a series of photographs that eventually became the book Sierra Nevada: The John Muir Trail. When Adams sent a copy to Secretary of the Interior Harold Ickes, the cabinet member showed it to Franklin Roosevelt. The photographs so delighted FDR that he wouldn't give the book back to Ickes. Adams sent Ickes a replacement copy, and FDR kept his with him in the White House.

After a few years, Ickes, Adams, and the Sierra Club successfully convinced Roosevelt to make Kings Canyon a national park in 1940. Roosevelt's designation specifically provided that the park be left totally undeveloped and roadless, so the only way FDR himself would ever experience it was through Adams' lenses.

4. HE WELCOMED COMMERCIAL ASSIGNMENTS.

While many of his contemporary fine art photographers shunned commercial assignments as crass or materialistic, Adams went out of his way to find paying gigs. If a company needed a camera for hire, Adams would generally show up, and as a result, he had some unlikely clients. According to The Ansel Adams Gallery, he snapped shots for everyone from IBM to AT&T to women's colleges to a dried fruit company. All of this commercial print work dismayed Adams's mentor Alfred Stieglitz and even worried Adams when he couldn't find time to work on his own projects. It did, however, keep the lights on.

5. HE AND GEORGIA O'KEEFFE WERE FRIENDS.

Adams and legendary painter O'Keeffe were pals and occasional traveling buddies who found common ground despite their very different artistic approaches. They met through their mutual friend/mentor Stieglitz—who eventually became O'Keeffe's husband—and became friends who traveled throughout the Southwest together during the 1930s. O'Keeffe would paint while Adams took photographs.

These journeys together led to some of the artists' best-known work, like Adams' portrait of O'Keeffe and a wrangler named Orville Cox, and while both artists revered nature and the American Southwest, Adams considered O'Keeffe the master when it came to capturing the area. 

“The Southwest is O’Keeffe’s land,” he wrote. “No one else has extracted from it such a style and color, or has revealed the essential forms so beautifully as she has in her paintings.”

The two remained close throughout their lives. Adams would visit O'Keeffe's ranch, and the two wrote to each other until Adams' death in 1984.

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