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28 Apr 2026

28 Apr 2026 1:26pm GMT

Show HN: Live Sun and Moon Dashboard with NASA Footage

28 Apr 2026 1:25pm GMT

Researchers say infrasound -- low-frequency vibrations from things like pipes, HVAC systems, and traffic that humans can't consciously hear -- may help explain why some old buildings feel unsettling or "haunted." Rodney Schmaltz, senior author and professor at MacEwan, says: "Consider visiting a supposedly haunted building. Your mood shifts, you feel agitated, but you can't see or hear anything unusual. In an old building, there is a good chance that infrasound is present, particularly in basements where aging pipes and ventilation systems produce low-frequency vibrations. If you were told the building was haunted, you might attribute that agitation to something supernatural. In reality, you may simply have been exposed to infrasound." ScienceBlog.com reports: Infrasound sits below roughly 20 Hz, the lower limit of what the human ear can ordinarily detect. It's generated by storms, by volcanic activity, by tectonic rumblings deep in the Earth's crust, and (this is the part that matters) by the mundane mechanical heartbeat of cities: ageing pipes, HVAC systems, traffic, industrial machinery. "Infrasound is pervasive in everyday environments, appearing near ventilation systems, traffic, and industrial machinery," says Schmaltz. Most of the time, we walk through it without a second thought. The question the team wanted to answer was whether walking through it was actually doing something to us, whether the frequency was registered somewhere below consciousness, somewhere we couldn't readily name. The experimental setup was deliberately ordinary. Thirty-six undergraduate students filed one at a time into isolated testing rooms and sat alone with a piece of music, either a calming instrumental or a horror-themed ambient track designed to provoke discomfort. Hidden subwoofers, including a 12-inch unit positioned in an adjacent hallway and a 16-inch speaker oriented toward the ceiling in a neighboring room, pumped infrasound at approximately 18 Hz into half those spaces. The participants had no idea. That last point turned out to be rather important. When the team ran the numbers, they found that participants couldn't reliably identify whether infrasound had been present. Their guesses were, statistically speaking, no better than chance. And according to Schmaltz, participants' beliefs about whether the infrasound was on had no detectable effect on their cortisol or mood. The physiological response didn't care what the participants thought was happening. It just happened anyway. What happened, specifically, was this: those exposed to infrasound reported higher irritability, lower interest in the music, and a tendency to rate the music as sadder, irrespective of whether it was the calming or the horror track. Cortisol levels, measured before and about 20 minutes after exposure, were also elevated. Kale Scatterty, the PhD student who led the work, notes that irritability and cortisol do tend to move together under ordinary stress, but adds that "infrasound exposure had effects on both outcomes that went beyond that natural relationship." That distinction matters more than it might seem. Previous theories about infrasound and paranormal experience have often leaned on anxiety as the explanatory mechanism, the idea that low-frequency sound triggers a kind of free-floating dread that the mind then reaches for supernatural explanations to account for. The new data don't really support that picture. Measures of anxiety didn't budge significantly. What went up was irritability and disinterest, a kind of sour, low-grade aversion rather than fear. That's perhaps a more honest description of how a lot of ghost stories actually feel in the telling: not screaming terror, but wrong atmosphere, a sense of unease that never quite crystallizes into something you can point at. The study has been published this week in Frontiers in Behavioral Neuroscience.

Trump Administration Will Pay More Energy Firms to Cancel Wind Farms

The Trump administration says it will reimburse energy companies $885 million to cancel two planned offshore wind farms, with the firms in turn agreeing to put money into oil and gas projects instead. "The deals are modeled after a similar agreement last month with the French energy giant TotalEnergies," notes the New York Times. "TotalEnergies forfeited its leases for two wind projects planned off the coasts of New York and North Carolina, while committing to a range of fossil-fuel investments." From the report: [...] The first new agreement affects Bluepoint Wind, a wind farm in the early stages of development off New York and New Jersey. The project was proposed by Global Infrastructure Partners, a part of asset manager BlackRock, and Ocean Winds, which is itself a joint venture between Engie and EDP Renewables, two European clean-energy firms. The second deal would cancel Golden State Wind, another early-stage venture off California's central coast. Golden State Wind is a 50-50 partnership between the developers Ocean Winds and Reventus Power. Both Bluepoint Wind and Golden State Wind agreed not to pursue any new offshore wind projects in the United States, although that pledge would not necessarily apply to the companies behind the ventures. Ocean Winds has also been developing another giant wind farm known as SouthCoast Wind, off Martha's Vineyard, Mass., that is much further along in the planning and permitting process. That project is not affected by Monday's announcement, although it has essentially been paused since Mr. Trump took office last year. [...] It is also unclear how much the companies will actually invest in new fossil fuel infrastructure. In documents released this month, Interior revealed that it would count investments that TotalEnergies made before the deal toward its pledge, raising questions over whether the company had any obligations to make additional investments.

Elon Musk and OpenAI CEO Sam Altman Head To Court

An anonymous reader quotes a report from the Associated Press: Technology tycoons Elon Musk and Sam Altman are poised to face off in a high-stakes trial revolving around the alleged betrayal, deceit and unbridled ambition that blurred the bickering billionaires' once-shared vision for the development of artificial intelligence. The trial, which started Monday with jury selection, centers on the 2015 birth of ChatGPT maker OpenAI as a nonprofit startup primarily funded by Musk before evolving into a capitalistic venture now valued at $852 billion. The trial's outcome could sway the balance of power in AI -- breakthrough technology that is increasingly being feared as a potential job killer and an existential threat to humanity's survival. Those perceived risks are among the reasons that Musk, the world's richest person, cites for filing an August 2024 lawsuit that will now be decided by a jury and U.S. District Judge Yvonne Gonzalez Rogers in Oakland, California. The civil lawsuit accuses Altman, OpenAI's CEO, and his top lieutenant, Greg Brockman, of double-crossing Musk by straying from the San Francisco company's founding mission to be an altruistic steward of a revolutionary technology. The lawsuit alleges they shifted into a moneymaking mode behind his back. OpenAI has brushed off Musk's allegations as an unfounded case of sour grapes that's aimed at undercutting its rapid growth and bolstering Musk's own xAI, which he launched in 2023 as a competitor. Gonzalez Rogers questioned potential jurors Monday about their views on Musk, Altman and artificial intelligence. Some jurors said they had negative views of Musk, but most said they would still be able to treat him fairly and focus on the facts of the case. [...] "Part of this is about whether a jury believes the people who will testify and whether they are credible," Gonzalez Rogers said during a court hearing earlier this year while explaining why she believe the case merited a trial. The judge will make the final decision on the case, with the jury serving in an advisory role. The latest development is that a jury has been seated. During selection, several prospective jurors expressed negative views of Elon Musk, but Judge Yvonne Gonzalez Rogers rejected attempts by Musk's lawyer to remove some of them solely on that basis, saying dislike of Musk does not automatically mean someone can't be fair. The court is selecting nine jurors, and the case is expected to wrap by May 21, when it would go to the jury. Tomorrow, April 28th, will feature opening statements.