Good morning. It's Tuesday, Oct. 27, and welcome to this week's Science & Technology newsletter. First time reading? Sign up here or forward to share with friends.
Welcome to our special quantum field theory issue! Since the launch of this newsletter, we've always known we wanted to go to the edge of our understanding of the quantum realm and how we model the universe. However, getting there requires laying the groundwork for some big ideas, which we'll walk you through in this issue.
First, we'll take a look at Albert Einstein's special theory of relativity and how it overturned humanity's understanding of space and time. Then, we'll dive into the world of quantum mechanics and break down how the reimagining of particles as waves revolutionized our picture of the subatomic world. Finally, we will combine the two to explain how quantum field theory describes particle interactions, including virtual particles and how matter is created and destroyed.
Want to share your thoughts on this newsletter? Whether it's something you enjoyed learning about, potential improvements, or a suggested topic for a future issue, simply reply to this newsletter or email [email protected].
—Marco Daniel Machado, 1440 Science & Technology Section Editor
PS—Missed a past newsletter, recently subscribed, or are curious to see what we've written about before? Check out our archive of topics and new resource feed here. |
|
|
|
The special theory of relativity consists of two postulates detailed by Albert Einstein in 1905. First, the laws of physics are identical for all observers—the principle of relativity. Second, the speed of light in a vacuum is the same for all observers.
> Galileo came up with a principle of relativity almost 300 years before Einstein.
> You can measure the speed of light at home using a microwave.
The postulates arose from a conflict between classical physics, which held that measured speeds depend on an observer's motion, and the theory of electromagnetism, which suggested that the speed of light is constant, regardless of motion. To resolve this, Einstein established the speed of light as the cosmic speed limit and modified how length, duration, and relative speed are calculated.
> Newton's laws of motion form the basis for classical physics.
> Watch how electric fields can transform into magnetic fields, thanks to relativity.
According to special relativity, time elapses more slowly for moving objects, and they appear to shrink in the direction of travel. Einstein's professor captured these effects geometrically by introducing spacetime—a combination of space and time. The mathematics of special relativity also revealed that mass and energy are equivalent, as expressed by E = mc2.
> Visualize how time dilation causes simultaneous events to no longer match, depending on one's motion.
> ... then use what you learned to try to solve these relativity paradoxes.
The concepts of special relativity have been validated by atomic clocks, particle accelerator experiments, and observations of cosmic ray showers. However, its speed limit clashed with Isaac Newton's picture of infinitely fast gravity, leading Einstein to generalize special relativity to incorporate gravity and curved spacetime.
> Some particles created in Earth's atmosphere wouldn't live long enough to reach Earth's surface if their lives weren't extended by special relativity.
> What makes special relativity different from general relativity?
Discover more:
> According to special relativity, changing the past via time travel is impossible.
> Special relativity is why gold looks yellowish, despite most metals being silver.
> Experience how moving near the speed of light narrows and distorts what you see by taking a stroll through Relativity Park.
Keep learning by exploring all our findings on Special Relativity here. |
|
|
|
|
Quantum mechanics is the mathematical foundation of quantum physics, the branch of science that describes the behavior of systems at atomic and subatomic scales. While Newton's laws form the basis of classical mechanics—which explains how bridges, planes, and other everyday objects work—quantum mechanics abandons the precise results of those laws for a system based on probability.
> Schrödinger's cat was popularized by quantum mechanics.
> Everyday objects also exhibit quantum effects, so why can't we see them?
Classical mechanics predicts that objects with nonzero temperature should radiate infinite energy. The solution—quantization—says that light can only exist in indivisible units. Like the minimum height requirement on a roller coaster, no light can exist if it doesn't meet its minimum emission threshold, which depends on its frequency. These thresholds limited high-frequency emissions and predicted a finite amount of radiated energy that matched observations.
> Watch a video explainer of classical physics' infinite-energy prediction, known as the ultraviolet catastrophe.
> Like energy, space and time may be quantized, meaning there could be a smallest possible unit of length and time.
Applying quantization to experiments involving light led to the wave-particle duality, in which light could be modeled as either discrete particles or electromagnetic waves. After electrons in atoms were identified as existing in discrete (quantized) energy levels, all matter began to be mathematically modeled as both extended waves and localized particles.
> Visualize the wave-particle duality, where a single electron interferes with itself.
> Instead of orbiting the nucleus like planets, electrons in the quantum model of the atom exist in probability clouds.
While imagining particles as waves introduced uncertainty into experimental outcomes—scientists can only predict probabilities rather than determine definitive results—quantum mechanics has been experimentally validated, accurately modeling atoms and enabling technologies such as microchips and lasers.
> Watch a visual explainer of Heisenberg's uncertainty principle.
> 3D renderings of atoms according to quantum mechanics look like clouds of bees.
Discover more:
> The wave-particle duality of light is tied to Albert Einstein's only Nobel Prize, and it's what makes digital cameras possible.
> Quantum mechanics allows particles to travel through impenetrable barriers.
> ... and for effects to occur before or at the same time as causes, breaking causality.
Keep learning by exploring all our findings on Quantum Mechanics here. |
|
|
|
|
Quantum field theory models nature's fundamental ingredients, including all known elementary particles and most forces, as vibrations in overlapping, universe-sized fields. For example, every electron is a vibration in the electron field, and magnets are pushed or pulled by disturbances in the electromagnetic field.
> Visualize quantum field theory and where these unique fields come from.
> Quantum fields explain why all electrons (or any particles of the same kind) are identical.
Early quantum mechanics successfully explained various phenomena by reframing particles as waves. However, it did not account for changes in particle number, which special relativity allows via mass-energy equivalence: E = mc2. In QFT, which unifies these theories, particles can be created or annihilated when a vibration in one field transfers energy and momentum to another field or to the same field. This resembles money being exchanged from one currency to another, or converted into other denominations of the same currency.
> Reconciling special relativity with quantum mechanics led one scientist to predict the existence of antimatter.
> ... and earned another a Nobel Prize for uncovering the mass limit of white dwarfs.
QFT reframes forces as temporary disturbances in force-carrying fields. The disturbances are often modeled as the exchange of virtual particles, which are not directly observable but simplify the mathematics. In this way, virtual particles transfer energy and momentum between coupled fields, thereby altering the motion of real particles, as traditional forces would do.
> Virtual particles can cause empty space to spontaneously move metal plates.
> Because of virtual particles, there is no such thing as empty space, but there is quantum foam.
QFT is the backbone of many successful theories, including quantum electrodynamics, which has made predictions that agree with experiments to 12 decimal places, and the Standard Model, which predicted the existence of the Higgs boson.
> What has been QFT's most accurate prediction?
> The Higgs boson is a vibration of the Higgs field, which gives elementary particles their mass.
Discover more:
> Often modeled as composed of three quarks, QFT reveals that protons are made of countless momentary particles.
> Richard Feynman developed a way to turn QFT calculations into simple pictures.
> Despite the accuracy of QFT, it made what's been described as "probably the worst theoretical prediction in the history of physics."
Keep learning by exploring all our findings on Quantum Field Theory here. |
|
|
|
|
1440 brings you the knowledge and context behind the week's stories:
Zero-click spyware has infected devices exposed to online ads from an Israeli ad agency, according to the University of Toronto's digital investigations team. (More)
> Zero-click attacks can install malware on your device without you taking any action.
> What is spyware and how can it get on your device?
A 9.9-magnitude earthquake warning was mistakenly issued before being withdrawn eight minutes later, in a first for the Japan Meteorological Agency. (More)
> The list of largest earthquakes in recorded history is led by a 9.5-magnitude quake.
> The scales used to measure earthquakes have no upper or lower limit, meaning we can calculate what kind of earthquake would destroy the sun.
Dozens of critically endangered orangutans were rescued from Indonesia as wildfires continue to burn across the country. (More)
> What's the difference between vulnerable, endangered, and critically endangered?
> Wildfire suppression includes parachuting specially trained firefighters into remote areas.
Google cut down about 250,000 trees at a site in Finland to build a data center as part of an AI infrastructure project. (More)
> Visualize how the world's forest area has changed in size every year since 1991.
> Explore a map of over 12,000 data centers around the world. |
|
|
|
|
> What happens if you put diesel fuel in a car that uses gasoline?
> Some fall foliage comes from pigments found in egg yolks and carrots.
> The world's largest algal bloom stretches from the Caribbean to West Africa.
> Learn about noble metals, which can withstand most types of corrosion.
> ... though many of them are still no match for royal water.
> Hydras aren't just mythological monsters—they're also real, immortal animals.
> This year's El Niño has made parts of the Pacific Ocean bluer than usual.
> Watch a stunning, high-fidelity simulation of a neutron star's birth, which takes less than a second.
> Kodak used a nuclear device with enriched uranium in the basement of its Rochester headquarters for over 30 years.
|
|
> Earth's oceans feature a year-round forecast of marine snow.
> The world's oldest isolated water smells like rotten eggs and tastes very salty.
> Been apple picking this season? Learn how different compounds help distinguish the more than 7,500 types of apples.
|
|
|
|
|
🔭 Want more? Explore over 100 of our write-ups and thousands of fascinating insights and resources at 1440's hub for Science & Technology. |
|
|
"Quantum field theory arose out of our need to describe the ephemeral nature of life." |
|
|
Behind the Name. Why 1440? The printing press was invented around the year 1440, spreading knowledge to the masses and changing the course of history. More facts: In every day, there are 1,440 minutes. We’re here to make each one count.
Want to connect with millions of insatiably curious minds? Become a 1440 partner here. |
|
1440 Media 111 N Canal St, Suite 1210 Chicago, IL 60606
Copyright © 2026, 1440 Media, All rights reserved. |
|
|
|
|
|
|
|
