The U.S. Food and Drug Administration (FDA) on Tuesday authorized the first wearable sensor that continuously tracks ketones—chemicals the body makes when it burns fat instead of sugar for fuel.

It is also the first device anywhere to monitor ketones and blood sugar at the same time, the FDA said.

When ketones climb too high, they can cause diabetic ketoacidosis, or DKA. The American Diabetes Association warns that DKA can worsen within hours and lead to coma or death if it goes untreated.

Hospital admissions for DKA have risen 55% over the past decade, according to Abbott, which makes the device.

Early symptoms are often mistaken for a stomach bug or another common infection, which delays care. Most people also do not keep a blood ketone meter at home.

“Knowing that ...

Some of the strangest weather in the solar system doesn’t happen on Earth or even in Jupiter’s Great Red Spot—it happens in the interiors of ice giants like Neptune and Uranus. Specifically, scientists have long believed that, at certain pressures and temperatures, it literally rains diamonds inside these planets. For the first time, scientists have mimicked the process they believe creates this phenomenon.

A new paper by physicists at Lawrence Livermore National Laboratory (LLNL), published in Nature Physics, resolves the 20-year-old scientific mystery and shows how the same physics that makes it rain diamonds inside Neptune could also help us triple our fusion energy output.

Let’s talk about the actual experiment first...

Results from an early-stage clinical trial, published in Nature Communications, showed encouraging outcomes among patients with newly diagnosed cancer whose tumors had spread to distant organs. Most strikingly, one patient experienced a pathologic complete response—meaning no viable cancer cells could be found—and remains cancerfree for more than two years without further treatment. These findings offer an important signal that a new approach may be able to overcome one of the disease’s greatest challenges: its resistance to immunotherapy.

“We desperately need new tools in our arsenal,” said Gulam Manji, MD, PhD, a medical oncologist specializing in pancreatic cancer and lead investigator of the trial...

Inside every electronic device, the flow of electricity is controlled by a switch called a transistor. For decades, these switches were made from silicon. More recently, engineers have turned to a material called gallium nitride (GaN), which enables small, efficient devices like smartphone chargers.

However, at very high voltages, electric fields inside these transistors can concentrate at specific points, causing them to fail prematurely. As a result, today’s GaN devices still struggle to perform at the highest voltage levels achieved by silicon.

To overcome this limitation, researchers in the Power and Wide-band-gap Electronics Research Lab (POWERlab) in EPFL’s School of Engi...