Huge amounts of data are needed to train machine-learning models to perform image classification tasks, such as identifying damage in satellite photos following a natural disaster. However, these data are not always easy to come by. Datasets may cost millions of dollars to generate, if usable data exist in the first place, and even the […]
Category: Research
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Microbes and minerals may have set off Earth’s oxygenation
For the first 2 billion years of Earth’s history, there was barely any oxygen in the air. While some microbes were photosynthesizing by the latter part of this period, oxygen had not yet accumulated at levels that would impact the global biosphere. But somewhere around 2.3 billion years ago, this stable, low-oxygen equilibrium shifted, and […]
How to clean solar panels without water
Solar power is expected to reach 10 percent of global power generation by the year 2030, and much of that is likely to be located in desert areas, where sunlight is abundant. But the accumulation of dust on solar panels or mirrors is already a significant issue — it can reduce the output of photovoltaic […]
Computational modeling guides development of new materials
Metal-organic frameworks, a class of materials with porous molecular structures, have a variety of possible applications, such as capturing harmful gases and catalyzing chemical reactions. Made of metal atoms linked by organic molecules, they can be configured in hundreds of thousands of different ways. To help researchers sift through all of the possible metal-organic framework […]
Study: Ice flow is more sensitive to stress than previously thought
The rate of glacier ice flow is more sensitive to stress than previously calculated, according to a new study by MIT researchers that upends a decades-old equation used to describe ice flow. Stress in this case refers to the forces acting on Antarctic glaciers, which are primarily influenced by gravity that drags the ice down […]
Toward batteries that pack twice as much energy per pound
In the endless quest to pack more energy into batteries without increasing their weight or volume, one especially promising technology is the solid-state battery. In these batteries, the usual liquid electrolyte that carries charges back and forth between the electrodes is replaced with a solid electrolyte layer. Such batteries could potentially not only deliver twice […]
Objection: No one can understand what you’re saying
Legal documents, such as contracts or deeds, are notoriously difficult for nonlawyers to understand. A new study from MIT cognitive scientists has determined just why these documents are often so impenetrable. After analyzing thousands of legal contracts and comparing them to other types of texts, the researchers found that lawyers have a habit of frequently […]
New maps show airplane contrails over the U.S. dropped steeply in 2020
As Covid-19’s initial wave crested around the world, travel restrictions and a drop in passengers led to a record number of grounded flights in 2020. The air travel reduction cleared the skies of not just jets but also the fluffy white contrails they produce high in the atmosphere. MIT engineers have mapped the contrails that […]
Q&A: Climate Grand Challenges finalists on building equity and fairness into climate solutions
Note: This is the first in a four-part interview series that will highlight the work of the Climate Grand Challenges finalists, ahead of the April announcement of several multiyear, flagship projects. The finalists in MIT’s first-ever Climate Grand Challenges competition each received $100,000 to develop bold, interdisciplinary research and innovation plans designed to attack some of […]
New MRI probe can reveal more of the brain’s inner workings
Using a novel probe for functional magnetic resonance imaging (fMRI), MIT biological engineers have devised a way to monitor individual populations of neurons and reveal how they interact with each other. Similar to how the gears of a clock interact in specific ways to turn the clock’s hands, different parts of the brain interact to […]
The benefits of peripheral vision for machines
Perhaps computer vision and human vision have more in common than meets the eye? Research from MIT suggests that a certain type of robust computer-vision model perceives visual representations similarly to the way humans do using peripheral vision. These models, known as adversarially robust models, are designed to overcome subtle bits of noise that have […]
How to help humans understand robots
Scientists who study human-robot interaction often focus on understanding human intentions from a robot’s perspective, so the robot learns to cooperate with people more effectively. But human-robot interaction is a two-way street, and the human also needs to learn how the robot behaves. Thanks to decades of cognitive science and educational psychology research, scientists have […]
Injecting fairness into machine-learning models
If a machine-learning model is trained using an unbalanced dataset, such as one that contains far more images of people with lighter skin than people with darker skin, there is serious risk the model’s predictions will be unfair when it is deployed in the real world. But this is only one part of the problem. […]
Study reveals chemical link between wildfire smoke and ozone depletion
The Australian wildfires in 2019 and 2020 were historic for how far and fast they spread, and for how long and powerfully they burned. All told, the devastating “Black Summer” fires blazed across more than 43 million acres of land, and extinguished or displaced nearly 3 billion animals. The fires also injected over 1 million […]
Using artificial intelligence to find anomalies hiding in massive datasets
Identifying a malfunction in the nation’s power grid can be like trying to find a needle in an enormous haystack. Hundreds of thousands of interrelated sensors spread across the U.S. capture data on electric current, voltage, and other critical information in real time, often taking multiple recordings per second. Researchers at the MIT-IBM Watson AI […]
A new, inexpensive catalyst speeds the production of oxygen from water
An electrochemical reaction that splits apart water molecules to produce oxygen is at the heart of multiple approaches aiming to produce alternative fuels for transportation. But this reaction has to be facilitated by a catalyst material, and today’s versions require the use of rare and expensive elements such as iridium, limiting the potential of such […]
Chemical synthesis yields potential antibiotic
Chemists at MIT have developed a novel way to synthesize himastatin, a natural compound that has shown potential as an antibiotic. Using their new synthesis, the researchers were able not only to produce himastatin but also to generate variants of the molecule, some of which also showed antimicrobial activity. They also discovered that the compound […]
More sensitive X-ray imaging
Scintillators are materials that emit light when bombarded with high-energy particles or X-rays. In medical or dental X-ray systems, they convert incoming X-ray radiation into visible light that can then be captured using film or photosensors. They’re also used for night-vision systems and for research, such as in particle detectors or electron microscopes. Researchers at […]
Physicists observe an exotic “multiferroic” state in an atomically thin material
MIT physicists have discovered an exotic “multiferroic” state in a material that is as thin as a single layer of atoms. Their observation is the first to confirm that multiferroic properties can exist in a perfectly two-dimensional material. The findings, published today in Nature, pave the way for developing smaller, faster, and more efficient data-storage […]
A security technique to fool would-be cyber attackers
Multiple programs running on the same computer may not be able to directly access each other’s hidden information, but because they share the same memory hardware, their secrets could be stolen by a malicious program through a “memory timing side-channel attack.” This malicious program notices delays when it tries to access a computer’s memory, because […]
Singing in the brain
For the first time, MIT neuroscientists have identified a population of neurons in the human brain that lights up when we hear singing, but not other types of music. These neurons, found in the auditory cortex, appear to respond to the specific combination of voice and music, but not to either regular speech or instrumental […]
A “hot Jupiter’s” dark side is revealed in detail for first time
MIT astronomers have obtained the clearest view yet of the perpetual dark side of an exoplanet that is “tidally locked” to its star. Their observations, combined with measurements of the planet’s permanent day side, provide the first detailed view of an exoplanet’s global atmosphere. “We’re now moving beyond taking isolated snapshots of specific regions of […]
Can machine-learning models overcome biased datasets?
Artificial intelligence systems may be able to complete tasks quickly, but that doesn’t mean they always do so fairly. If the datasets used to train machine-learning models contain biased data, it is likely the system could exhibit that same bias when it makes decisions in practice. For instance, if a dataset contains mostly images of […]
A revolution in learning
To understand a country, it helps to know its schools. To grasp Mexico, MIT historian Tanalís Padilla believes, that means learning about its rural “normales,” teacher-training schools with outsized historical influence on the country’s politics. This might seem surprising. At its height, the system of rural normales consisted of only 35 such boarding schools, scattered […]
Toward a stronger defense of personal data
A heart attack patient, recently discharged from the hospital, is using a smartwatch to help monitor his electrocardiogram signals. The smartwatch may seem secure, but the neural network processing that health information is using private data that could still be stolen by a malicious agent through a side-channel attack. A side-channel attack seeks to gather […]
Credit card-sized device focuses terahertz energy to generate high-resolution images
Researchers have created a device that enables them to electronically steer and focus a beam of terahertz electromagnetic energy with extreme precision. This opens the door to high-resolution, real-time imaging devices that are hundredths the size of other radar systems and more robust than other optical systems. Terahertz waves, located on the electromagnetic spectrum between […]
Protein structure offers clues to drug-resistance mechanism
MIT chemists have discovered the structure of a protein that can pump toxic molecules out of bacterial cells. Proteins similar to this one, which is found in E. coli, are believed to help bacteria become resistant to multiple antibiotics. Using nuclear magnetic resonance (NMR) spectroscopy, the researchers were able to determine how the structure of […]
Dendrites may help neurons perform complicated calculations
Within the human brain, neurons perform complex calculations on information they receive. Researchers at MIT have now demonstrated how dendrites — branch-like extensions that protrude from neurons — help to perform those computations. The researchers found that within a single neuron, different types of dendrites receive input from distinct parts of the brain, and process […]
Size matters in particle treatments of traumatic injuries
Traumatic injuries are the leading cause of death in the U.S. among people 45 and under, and such injuries account for more than 3 million deaths per year worldwide. To reduce the death toll of such injuries, many researchers are working on injectable nanoparticles that can home in on the site of an internal injury […]
A new atlas of cells that carry blood to the brain
While neurons and glial cells are by far the most numerous cells in the brain, many other types of cells play important roles. Among those are cerebrovascular cells, which form the blood vessels that deliver oxygen and other nutrients to the brain. Those cells, which comprise only 0.3 percent of the brain’s cells, also make […]
First-ever Climate Grand Challenges recognizes 27 finalists
All-carbon buildings, climate-resilient crops, and new tools to improve the prediction of extreme weather events are just a few of the 27 bold, interdisciplinary research projects selected as finalists from a field of almost 100 proposals in the first MIT Climate Grand Challenges competition. Each of the finalist teams received $100,000 to develop a comprehensive […]
Solar-powered system offers a route to inexpensive desalination
An estimated two-thirds of humanity is affected by shortages of water, and many such areas in the developing world also face a lack of dependable electricity. Widespread research efforts have thus focused on ways to desalinate seawater or brackish water using just solar heat. Many such efforts have run into problems with fouling of equipment […]