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Elon Musk‘s brain implant startup Neuralink, which was valued at close to $2 billion (roughly Rs. 16,500 crore) in a private fundraising round two years ago, is now worth around $5 billion (roughly Rs. 41,300 crore) based on privately executed stock trades described to Reuters by five sources with knowledge of the matter.

Some purchases by bullish investors boosted the valuation in recent months, ahead of Neuralink’s May 25 announcement that U.S. regulators had approved a human trial on its brain chip, the sources said.

Experts have said it could take several years for Neuralink to secure commercial use clearance. Kip Ludwig, former program director for neural engineering at the U.S. National Institutes of Health (NIH), said he “optimistically” expected Neuralink to take at least 10 more years to commercialize its brain implant. The company also faces other challenges that include federal probes into its handling of animal research.

Following the trial’s approval, however, Neuralink shares were marketed privately to investors in recent days at a $7 billion (roughly Rs. 57,900 crore) valuation, equivalent to $55 (roughly Rs. 4,500) per share, according to an email seen by Reuters. Reuters could not establish whether the seller found buyers for that price. The email cited the U.S. Food and Drug Administration’s (FDA) approval of the clinical trial as grounds for the deal being “sweeter.”

Neuralink executives and Musk did not respond to requests for comment.

Musk has expressed grand ambitions for Neuralink, saying its chip would allow healthy and disabled people alike to pop into neighbourhood facilities for speedy surgical insertions of devices to treat obesity, autism, depression and schizophrenia. He even sees them being used for web-surfing and telepathy. A Neuralink executive recently gave more modest short-term objectives, such as helping paralyzed patients communicate through computerized text without typing.

The stock transactions at a valuation of around $5 billion (roughly Rs. 41,300 crore) have been carried out by shareholders such as employees and the company’s early backers, rather than Neuralink selling new shares to investors. Such so-called secondary trades are an imperfect gauge of a company’s value; their volume is thin and they lack the wider market consensus of a fundraising round or initial public offering (IPO).

Neuralink’s valuation jump in secondary trades is in sharp contrast to other startups. About 85percent of pre-IPO companies are currently valued in secondary trades at an average discount of 47 percent to their last funding round, according to data provider Caplight.

In Neuralink’s last known fundraising in 2021, it raised $205 million (roughly Rs. 1,700 crore) at an approximately $2 billion (roughly Rs. 16,500 crore) valuation, according to data provider Pitchbook.

Many of the recent stock sales have been to relatively small investors, who typically focus more on getting a slice of a company owned by Musk than scrutinizing its valuation. The maximum amount sought for the Neuralink shares marketed for sale at a $7 billion (roughly Rs. 57,900 crore) valuation was just $500,000, according to the email seen by Reuters.

Sim Desai, chief executive of Hiive, an online platform where the shares are traded, said demand for Neuralink stock has been “tremendous.” He pegged the valuation that buyers are willing to pay at around $4.5 billion (roughly Rs. 37,200 crore).

Some biomedical experts are skeptical. Arun Sridhar, a scientist and entrepreneur who specializes in neuromodulation, called Neuralink’s valuation “bonkers” based on how early the brain implant is in its clinical development.

“A study to assess safety and tolerability is in no shape or form valid to justify a $5 billion (roughly Rs. 41,300 crore) valuation,” said Sridhar, who helped launch Galvani Bioelectronics, a developer of implants backed by GSK Plc and Alphabet Inc’s Verily Life Sciences. Galvani is not a competitor of Neuralink because its implants under development will be installed in an artery to the spleen to help treat rheumatoid arthritis, rather than the brain.

Investigations

The FDA initially rejected Neuralink’s request for a human trial last year, citing safety reasons, Reuters has reported. Even after securing approval, the company faces several challenges.

Neuralink has come under scrutiny from U.S. lawmakers after Reuters reported in May that its animal-research board may have violated conflict-of-interest regulations. Neuralink employees who sat on that board, which oversees the welfare of the animals that were being tested, also stood to benefit from the implant’s quick development. Neuralink stock that some of the employees hold has jumped around 150 percent in value in just two years, based on the secondary trades.

The law enforcement arm of the U.S. Department of Agriculture has been investigating Neuralink for potential animal-welfare violations. Neuralink staff told Reuters last year that the company was rushing and botching surgeries on monkeys, pigs and sheep, resulting in far more animal deaths than necessary, as Musk pressured staff to receive FDA approval.

The Department of Transportation is separately probing whether Neuralink illegally transported dangerous pathogens on chips removed from monkey brains without proper containment measures.

Neither Musk nor Neuralink have responded to multiple requests for comment on the probes or the Reuters reports.

© Thomson Reuters 2023
 


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NASA Satellite Detects Tree Leaf Changes as Early Volcano Eruption Warning Signal

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NASA Satellite Detects Tree Leaf Changes as Early Volcano Eruption Warning Signal

NASA scientists might soon be able to forecast volcanic eruptions by monitoring how trees respond from space. Now, in a new collaboration with the Smithsonian Institution, they have discovered that tree leaves grow lusher and greener when previously dormant volcanic carbon dioxide seeps up from the ground — an early warning that a cone of magma is pushing upwards. Now, using satellites such as Landsat 8 and data from the recent AVUELO mission, scientists think this biological response could be visible remotely, serving as an added layer of early warning for eruptions in high-risk areas that currently menace millions worldwide.

NASA Uses Tree Greening as Satellite Clue for Early Volcano Eruption Warnings in Remote Regions

As per the research by NASA’s Earth Science Division at Ames Research Centre, greening occurs when trees absorb volcanic carbon dioxide released as magma rises. These emissions precede sulfur dioxide and are harder to detect directly from orbit.

While carbon dioxide does not always appear obvious in satellite images, its downstream effects — enhanced vegetation, for example — can help reinforce existing volcanic early warning systems, notes volcanologist Florian Schwandner. It could be important because, as the U.S. Geological Survey says, the country is still one of the most volcanically active.

Globally, about 1,350 potentially active volcanoes exist, many in remote or hazardous locations. On-site gas measurement is costly and dangerous, prompting volcanologists like Robert Bogue and Nicole Guinn to explore tree-based proxies.

Guinn’s study of tree leaves around Sicily’s Mount Etna found a strong correlation between leaf colour and underground volcanic activity. Satellites such as Sentinel-2 and Terra have proven capable of capturing these subtle vegetative changes, particularly in forested volcanic areas.

To confirm this method, climate scientist Josh Fisher led NASA-Smithsonian teams in March 2025 to Panama and Costa Rica, collecting tree samples and measuring gas levels near active volcanoes. Fisher sees this interdisciplinary research as key to both volcano forecasting and understanding long-term tree response to atmospheric carbon dioxide, which will reveal future climate conditions.

The benefits of early carbon dioxide detection have been demonstrated in the 2017 eruption of Mayon volcano in the Philippines, where it allowed mass evacuations and saved more than 56,000 lives. It has its limitations, like bad terrain or too much environmental noise, but it could be a game-changer.

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Russian Researchers Discover 11 New AGNs in All-Sky X-ray Survey

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Russian Researchers Discover 11 New AGNs in All-Sky X-ray Survey

11 new active galactic nuclei were detected in an all-sky X-ray source survey conducted by researchers from the Russian Academy of Sciences. A team led by Grigory Uskov has been on an inspection of the X-ray sources found in the ART-XC telescope of the Spektr-RG (SRG) space observatory. So far, their studies have resulted in the identification of more than 50 AGNs and several cataclysmic variables. A deeper dive into the physical properties and radiation nature of those galaxies will be crucial for a wide range of studies such as statistical insights, refining and testing cosmological models, classification studies etc.

Classification of newly found AGN

According to the recent study published in Astronomy letters, the newly discovered active galactic nuclei from the ARTSS1-5 catalog are categorised as the Seyfert galaxies, seven type 1 (Sy 1), three type 1.9 (Sy 1.9) and one type 2 (Sy 2).

AGN or active galactic nuclei are considered as the most luminous persistent sources of electromagnetic radiation in the universe. These compact regions at the centre of a galaxy are extremely energetic due to accretion onto a supermassive black hole or star formation activity at the galaxy’s center.

Based on their luminosity, AGNs are categorised as Seyfert Galaxies and Quasars. Seyfert galaxies are lower-luminosity AGNs where the host galaxy is clearly visible and emit a lot of infrared radiation, and have broad optical emission lines.

Research findings

The published paper states the 11 newly found galaxies are located relatively nearby, at redshifts of 0.028-0.258. The X-ray luminosities of these sources are within the range of 2 to 300 tredecillion erg/s, therefore typical for AGNs at the present epoch.

The spectrum of one of the new AGNs, designated SRGA J000132.9+240237, is described by a power law with a slope smaller than 0.5, which suggests a strong absorption and a significant contribution of the radiation reflected from the galaxy’s dusty torus. The authors of the paper noted that longer X-ray observations are required to determine the physical properties of this AGN.

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New Study Reveals Recent Ice Gains in Antarctica, But Long-Term Melting Continues

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New Study Reveals Recent Ice Gains in Antarctica, But Long-Term Melting Continues

Global warming and climate change have been subjects of major concern for a long time. One of the key indicators of this phenomenon is the melting of ice in the polar regions. Researchers from Tongji University in Shanghai have been using NASA satellite data to track changes in Antarctica’s ice sheet over more than two decades. Their newest study states that despite the increase in global temperature, Antarctica has gained ice in recent years. However, it cannot be considered as a miraculous reversal in global warming because over these two decades, the overall trend is substantial ice loss. Most of the gains have been caused by unusual increased precipitation over Antarctica.

About the New study

According to the new study , NASA’s Gravity Recovery And Climate Experiment (GRACE) and GRACE Follow-On satellites have been monitoring this ice sheet since 2002. The ice sheet covering Antarctica is the largest mass of ice on Earth

The satellite data revealed that the sheet experienced a sustained period of ice loss between 2002 and 2020. The ice loss accelerated in the latter half of that period, increasing from an average loss of about 81 billion tons (74 billion metric tons) per year between 2002 and 2010, to a loss of about 157 billion tons (142 billion metric tons) between 2011 and 2020, according to the study. However, the trend then shifted.

The ice sheet gained mass from 2021 to 2023 at an average rate of about 119 billion tons (108 metric tons) per year. Four glaciers in eastern Antarctica also flipped from accelerated ice loss to significant mass gain.

General Trend in global warming

Climate change doesn’t mean that everywhere on Earth will get hotter at the same rate, so a single region will never tell the whole story of our warming world.

Historically, temperatures over much of Antarctica have remained relatively stable, particularly compared to the Arctic. Antarctica’s sea ice has also been much more stable relative to the Arctic, but that’s been changing in recent years.

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