Roughly 1 in 125 people have autism spectrum disorder globally

1 in 31 kids in the US has autism

That figure comes from an analysis published by the US Centers for Disease Control and Prevention based on data gathered on eight-year-olds in 2022. Its figures mark a significant increase from 2000, when the estimated autism figure was one in 150, but improvements in diagnosis and changes to the disease criteria that broadened the diagnostic criteria are widely believed to be driving that increase.

Autism rate increases are mostly among those with milder symptoms, not individuals with severe symptoms

Broader case definitions and better screening are typically now detecting more milder cases of autism rather than individuals who have severe impairments (who could be categorized as having profound autism). Profound autism rates, an autism researcher says in this article, have stayed proportionately steady.

Autism Spectrum Disorder, defined in 2013, was previously categorized as numerous disorders

This exploration of ASD history walks through how autism science and diagnoses have evolved over the decades, including the new category in the DSM-4 in 1994 that created Asperger's disorder and pervasive developmental disorders, and the new, broader ASD definition in 2013 in the DSM-5 that has led to more diagnoses.

The sibling of someone with autism has a 20% chance of developing ASD

The disorder is strongly linked with inheritance, and research suggests that if one child has ASD, there's a one in 5 chance the next child will develop autism, which is seven times more likely than the general population.

Autism occurs among women, too

Males have higher rates of diagnosed autism than females, but recently scientists and people with autism have been exploring if females have been disproportionately missed in screening and if girls are perhaps masking their symptoms better, leading to missed diagnoses.

A growing number of autism researchers with the disorder are reshaping the field

People with autism are now leading research on the effects of stigma and discrimination and promoting more studies on public services for autistic people. They also serve as editors, reviewers, and board members on autism academic journals, creating a new chapter in a field littered with painful stereotypes and prejudice.

Diagnosis as an adult can have huge benefits, including helping someone with ASD to feel real

This first-person account of a woman diagnosed with autism at age 31 covers her experience of why it was useful for her to receive her diagnosis as an adult and how it helped her to understand her life and her feelings of 'being an imposter.'

Less than 1% of people globally have schizophrenia, a syndrome strongly linked to genetics

Schizophrenia's causes remain largely unknown, though scientists suggest it's caused by multiple factors. Its symptoms include disruption of thought processes rather than the exhibiting of multiple personalities. This brief video provides an overview of the condition.

More than 5 million Americans have more than one autoimmune disease

Overall, about 4.6% of the US population—15 million people—have an autoimmune condition. Some common examples include rheumatoid arthritis, psoriasis, type 1 diabetes, Grave's disease, and autoimmune thyroiditis.

Roughly 10% of the world has SSAD—SAD’s milder, nonclinical cousin

Subsyndromal affective disorder is diagnosed when someone exhibits two of the nine major criteria for depression (but not more than five) as a result of seasonal changes. While it is milder than primary SAD, SSAD is still significant and impacts millions.

Some UK doctors pushed for broad 'do not resuscitate' orders for autistic adults during COVID

The controversial push was to create such orders without individuals' or their families' consent, underscoring modern-day prejudice against people on the spectrum.

Autism and ADHD may have overlapping symptoms and someone can have both disorders

This video explores similarities and differences between these two disorders, which both have genetic causes. Challenges with attention, hyperactivity, and impulsivity are typical of ADHD. Fidgeting, problems picking up on social cues, emotional dysregulation, and being oblivious to time may occur with both disorders—though the impetus for these behaviors may differ.

Roughly 15 of every 1,000 people in the US have smell disorders

Anosmia is a lack of a sense of smell. It can be present at birth, related to diseases including Parkinson's, Alzheimer's, and COVID-19, or have unknown causes.

'Love on the Spectrum,' a popular Netflix reality show, is following people on the autism spectrum as they navigate romantic relationships

This is one of Netflix's biggest shows, something this podcast says is due partly to the fact that the series both scratches the itch for people who enjoy reality dating viewing and the program is conducted in a nonexploitative, sensitive way that makes viewers truly want the best for the people navigating these situations.

Roughly 10% of the world's population is older than 65 (2023 data)

With recent advances in medicine, sanitation, and nutrition, expected lifespans have rapidly risen around the globe—resulting in a rapidly aging global population. The worldwide distribution has seen a nearly 600% jump in the population of people aged 65 and older.

More than 5% of the world's population has disabling hearing loss

Disabling hearing loss is defined as hearing loss greater than 35 decibels in the better hearing ear. (For context, that means the sound of leaves rustling, at roughly 30 decibels, would be inaudible even to your better-hearing ear.) The World Health Organization's data suggests that more than 5% of the world's population has this level of loss requiring rehabilitation, which amounts to 430 million people—including 34 million children.

Females are diagnosed with MS roughly 3 to 4 times more often than males

This PBS documentary traces a filmmaker's personal journey with MS after being diagnosed at age 26. It encompasses both his efforts to stymie the disease's progression and his search for answers about the disease, when, statistically, he seemed at low risk due to his gender, lack of known family risk, and other factors.

See the global blindness burden by cause and continent

These charts show the estimated number of people worldwide with blindness due to cataract, glaucoma, refractive disorders, age-related macular degeneration, malaria, river blindness, trachoma, and other causes.

35% of polled Americans said they'd view people differently if they knew they had a mental illness

In April 2025 polling, mental health remained highly stigmatized in the US. Though 88% of US adults say a mental health disorder is nothing to be ashamed about, 84% of them think the term "mental illness" carries a stigma and only about half of respondents said they'd feel comfortable sharing their mental health struggles with others.

About 12.5% of US adults experience a phobia in their lifetime, a diagnosis that hinges on the intense fear interfering with daily life and persisting for at least six months.

Losing the kids to video games

An estimated 60 million people suffer from internet gaming disorder worldwide, a category created by the World Health Organization in 2018 to help communities support individuals plagued by pathological play. As the world's most-played game of all...

About 10%-15% of people experience chronic insomnia

How often would you say you struggle to stay or fall asleep? If it's more than three times per week (and has been going on for at least one month), then you might have one of the most common sleep disorders: insomnia.

In 2019, videos on TikTok convinced children they had Tourette syndrome

Right before the COVID-19 pandemic, an "outbreak" of Tourette syndrome was attributed to videos from a German TikToker who documented his life with the condition. The children experiencing the symptoms all had the same tics, which experts say was a case of mass sociogenic illness, also referred to as mass hysteria.

Gestational diabetes occurs when the body can't produce insulin during pregnancy

Globally, pregnant people are increasingly at risk to develop gestational diabetes due to rising maternal ages and obesity rates. The condition is associated with heavier fetal weight, congenital abnormalities, and perinatal mortality, which includes stillbirths and deaths of babies younger than 7 days old.

There are hundreds of subtypes of cancer, making a universal cure nearly impossible

Cancer is an umbrella term for over 200 different diseases, each with its own subtypes, genetic mutations, and behaviors. This diversity means that a treatment effective for one cancer type or patient may be ineffective for others. Moreover, as tumors grow, their cells accumulate different mutations, creating subclones with unique characteristics.

Tetrachromacy allows humans to observe 10 times the normal amount of colors

Resulting from a mutation on the X chromosome, the rare genetic condition causes individuals to possess an additional type of photoreceptor cell, typically sensitive to the orange range, located between the standard red and green cones. This enables the perception of approximately 100 million colors.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

Fireworks-related ER visits are on the rise—in 2024, they increased by 52% as compared to the prior year.

Larger animals like giraffes, elephants, and blue whales have developed a unique defense against cancer, a phenomenon known as Peto's Paradox

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

US housing costs have risen by roughly 175% between 1991 and 2026—but a growing number of Gen Zers are becoming homeowners anyway. In 2025, 4% of homebuyers were Gen Z, up from 3% the year before.

Between 10 million and 50 million people in the US develop rashes from poison ivy, poison sumac, and poison oak each year.

This real-time tracking of the hantavirus cruise ship outbreak in May 2026 offers a unique glimpse into the global reach of the outbreak and whether the virus sickened passengers and their communities around the world.

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

Use this calculator to find the dollar value of your mental load, from meal planning to coordinating after-school care for your children.

All rainbows are 'raincircles' caused by water droplets separating white sunlight into a spectrum of colors, but Earth's surface blocks the bottom half of the circle from our line of sight.

Electrical grids worldwide must double their power delivery capacity by 2050 to meet surging demand from AI and electric vehicles.

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

Listen to an in-depth conversation on the links between Parkinson's disease and herbicide exposure and the challenging pace of scientific investigation.

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

Up to a million Girl Scouts sell about 200 million cookie boxes every spring, generating $800 million, largely because refusing a child is frowned upon

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in terms of casualties, forces mobilized, and displacement of civilians.

Astronauts have repaired genetic damage in space using CRISPR—a molecular tool that can make precise changes to DNA and is used in single-celled organisms to attack invasive viruses.

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

Coral polyps reproduce via broadcast spawning, where entire reefs simultaneously release reproductive cells for about one hour, once a year.

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

The 1987 Nintendo video game 'Stadium Events' isn't known for being particularly fun, but its scarcity has made it a highly sought-after item that has sold for up to $35K at auction.