Components of the 'ghost gun' allegedly used by Luigi Mangione were 3D printed

3D printing has made musical instruments more accessible

Violins fabricated from durable plastic, rather than being built from wood, can cost hundreds of dollars less, allowing children to try them out without financial pressure. They can be made in colors that appeal to children, sizes tailored to their bodies, and with tactile guides to help visually impaired learners.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Chip-based 3D printers can be pocket-sized and involve no moving parts

Researchers have demonstrated a proof-of-concept version of a chip-based 3D printer that emits visible light onto light-sensitive resin to construct solid shapes. The technology may provide a portable, low-cost solution for future, small-scale fabrication needs.

Additive manufacturing consists of seven different process categories

Although 3D printing has become synonymous with the term, objects can be fabricated without filaments of hot plastic or light-sensitive powders. For example, during sheet lamination, ultrasonic waves—high-frequency vibrations—can join metal sheets by creating molecular bonds through friction.

Watch the engineering challenges overcome in turning a 3D printer into a tattoo machine

The DIY project required reprogramming the printer to operate on a curved, 2D surface rather than making flat layers in 3D, editing replacement firmware to bypass temperature safety checks, and developing a rapid system to stop the tattoo in case of an emergency. The final product printed "LEG" on a volunteer's leg.

Explore a library of data files for 3D printing

Data files are organized by category, including gadgets, learning, and fashion, with most available in .stl format, which is native to computer-aided design software, and presliced. Some files are also available in .3mf, an open-source file format developed as a universal standard for high-fidelity 3D printing.

As of 2025, the Factory of the Future 1.0 is the world's largest 3D printer

Housed at the University of Maine, the machine incorporates AI and can utilize bio-based materials to construct homes exceeding 3,000 square feet in size. Homes made from these materials are fully recyclable, as their components can be deconstructed, ground up, and reused as raw materials for printing.

The first 3D printing patent was filed in 1967

Wyn Swainson, an English literature graduate student, filed a patent in Denmark for a system that scans an object and uses the scanning data to rebuild it using lasers that harden light-sensitive plastic. However, he never developed a working prototype. The idea originated from wanting to produce recreations of sculptures.

Mosquito necroprinting uses an insect's mouthpart as the printer nozzle

Mosquitoes are abundant, and their nozzles are 32-100 times cheaper to harvest than to create from scratch out of metal or glass. By coating the organic nozzle to increase its strength, researchers are employing necroprinting to create tiny structures at better resolutions than commercial alternatives.

Watch a time-lapse of 3D printing a Groot figurine

The total printing time on the Prusa i3 MK2 printer was 12 hours and 32 minutes, with the head alone taking nearly 5 hours to print from layering plastic filament.

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.

The Cybertruck's custom alloy exoskeleton withstood gunfire

Although the Cybertruck was not designed to be bulletproof, ballistics tests with Glock, MP5, shotgun, and Tommy gun rounds showed the vehicle sustained only minor damage, such as impact craters and cracks in the glass, without fully penetrating the structure.

Individuals have been convicted of ordering assassinations from the dark web

Researchers have uncovered online storefronts allegedly run by members of various mafia or hitmen that offer to harm or murder individuals in exchange for monetary payment. However, no known murder has been attributed to any of them, and cybercrime task forces believe them to be scams (warning—sensitive content).

See renderings of Frank Lloyd Wright’s unmade buildings

Only about half of Frank Lloyd Wright’s over 1,000 designs were actually built. In 2018, the Frank Lloyd Wright Foundation commissioned Spanish architect and 3D designer David Romero to make digital models to see what Wright’s unrealized structures would look like.

Mario was named after Nintendo’s landlord

“Donkey Kong” designer Shigeru Miyamoto replaced Popeye, the sailor, with the overall-clad, mustachioed carpenter Jumpman, named after his primary skill—jumping over rolling barrels. When the game was translated into English, Jumpman’s name was changed to Mario, a nod to Mario Segale, the landlord for Nintendo’s American office.

Learn more about the history of fireworks, which date back to an accidental invention during an alchemist's quest for information about immortality

When bamboo in China was tossed into fire in 200 BCE, there was an explosion. About 1000 years later, around 800 CE, an alchemist searching for secrets to immortality mixed sulfur, charcoal, and potassium nitrate together, leading to gunpowder. That mixture was then packed into bamboo or paper tubes, leading to fireworks.

A man who counterfeited over $1M explains how to counterfeit money

In 2019, after Jeff Turner forged US banknotes such as the 1996-series $100 bill and the 2013 “blue note,” he was indicted on federal conspiracy and served 10 months in prison. In this video, Turner explains how to spot a fake banknote, and provides information about the materials and processes required to make fake money.

Most Mardi Gras floats are constructed from foam and papier-mache

The moving sets were originally drawn by mules and made of wood. Now, they're motorized and intricately crafted from foam and papier-mache. This virtual tour of Mardi Gras World—a New Orleans warehouse responsible for floats for various krewes, as well as for Disney and Six Flags—showcases their vibrant designs.

19th-century Americans used technology to try to prove the existence of ghosts

In the 19th century, following technological advancements like the telegraph, phonograph, and others, efforts were made to capture proof of ghosts. These technologies seemed supernatural in their own right and emerged at the same time Spiritualism took off in the US, resulting in new approaches to connecting with the dead.

The ghost of Bobby Dunbar

In 1912, a four-year-old Louisiana boy went missing for eight months. Contemporary accounts differed in his mother's reaction upon seeing him; some claimed she was overjoyed, others that she didn't recognize him. Shortly after, a second woman claimed the child was hers, though he remained with the first woman. In 2004, DNA analysis determined the child had not been related to the family, suggesting the kidnapping was never solved.

Modern fan fiction exists in a legal gray area

Modern copyright law prohibits using someone's intellectual property (like a character) without their permission. By and large, fan fiction is tacitly condoned by copyright holders because it's commonly distributed for free. If anything, the copyright holders often benefit by allowing passionate fan communities to flourish.

Read the FDA's statement on concerns over compound pharmacies

GLP-1 drugs popularity for weight loss and treating diabetes, led to a significant supply shortage and the rise of compound pharmacies, which produce customized drug formulations but lack formal approval from regulators. The drugs are ostensibly the same, but manufacturing methods lead to variations in concentration, filler compounds, and more.

Little League sensation Danny Almonte was two years older than his competitors

The New York pitcher was a hotshot pitcher in the 2001 Little League World Series, catapulting his Bronx team to a third-place finish thanks to a no-hitter and a perfect game. Sports Illustrated eventually reported that Almonte was 14, not 12, and that his coach and father had knowingly misled Little League. They were both banned, though Almonte himself was cleared of all wrongdoing.

10 of the original 14 copies of the Bill of Rights still exist

Clerks produced 13 copies for the states, plus one federal copy. Today, eight states still hold theirs. Georgia's and New York's were likely burned, Pennsylvania's was stolen, and Maryland's whereabouts remain unknown.

The game 'Counter-Strike' was developed in a dorm room

College student Minh Le designed the game through "modding," effectively building on the code of a preexisting game, the game "Half-Life" in his spare time.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

How a lawn gnome became the hottest item at the Masters

The kitschy piece of memorabilia debuted in 2016 and has since become a highly sought-after collectible for Master attendees. This ESPN deep dive explores how it happened and what makes the strange little item so attractive for golf fans.

Unlike the models made by large AI companies, open-weight models can have their safeguards removed or weakened, a process that has become increasingly easy and may expose users to harmful information.

This removal is made possible by developers making the parameters behind their models publicly known. By adjusting these parameters, users can modify how the model processes and provides information. Many of these models can be downloaded locally, preventing developers from seeing how people are using them.

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

The concept of phantom limbs, the perception that amputated limbs are still present, dates back to a French military surgeon in the 16th century.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

The animatronic shark from Steven Spielberg's 'Jaws,' the first modern blockbuster, was a complex underwater apparatus called 'Bruce.'

The first horror movie is believed to be George Méliès' 1986 short 'The Haunted Castle,' which pioneered the use of special effects

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

The identity of the Tank Man in the iconic photo from the 1989 Tiananmen Square protests remains unknown and was possibly killed.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

Domino's Pizza's 30-minute delivery guarantee was responsible for the chain's 1980s surge, but it was discontinued after the company was found liable for delivery driver accidents.

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

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

'Saturday Night Fever,' the 1977 film that introduced disco to the mainstream, was based on a fabricated magazine story.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

Dirty lightning is a thunderstorm created from friction between rising and falling flows of ash and smoke during volcanic eruptions.

Elk Cloner, the first computer virus to spread in public, was written as a practical joke by Richard Skrenta, a Pittsburgh high school student.

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.

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

Telehealth demand for GLP-1s for weight loss is booming as consumers seek easier access.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

The 2026 Ebola outbreak in the DRC is spurring new Ebola vaccine development for the Bundibugyo species.

In 1939, baseball star Lou Gehrig delivered his inspirational 'Luckiest Man' speech after retiring due to the health condition that now bears his name.