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Exclusive: International timekeepers to vote on changing the leap second to a leap hour

Jul 08, 2026 |

| Scientific American

To align Universal Coordinated Time with the Earth's rotation, a second occasionally gets added to the year. That may change in 2027 International timekeeping authorities are preparing to vote on a proposal to make the leap second—an extra second that is occasionally added to the year to keep Universal Coordinated Time in tune with Earth's rotation—into a leap hour by 2027.

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Scientists get clearest view yet of a spreading seafloor

Jul 08, 2026 |

By Sam Macdonald , Andrea Thompson

| Scientific American

A rare eruption in the Indian Ocean let researchers capture one of the clearest views yet of a seafloor spreading event Kilometers below the ocean's surface, Earth's seafloors are on the move. Across a massive network of underwater mountain chains known as mid-ocean ridges, tectonic plates slowly pull apart, belching molten rock at the spreading seams. As this lava cools, it forms new oceanic crust—literally the world's largest game of The Floor Is Lava.

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Can we stop El Niño before it starts?

Jul 08, 2026 |

By Cody Cottier, Andrea Thompson

| Scientific American

A controversial geoengineering proposal suggests that brightening clouds off South America could weaken a burgeoning El Niño, but major technical and ethical questions remain Throughout the coming months, El Niño is forecast to bring droughts, heat waves and other extreme weather to every continent on Earth. The cyclical climate event, driven by unusually warm ocean temperatures in the equatorial Pacific, has been gaining steam, with water temperatures reaching record highs.

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RFK, Jr. is turning his attention to another vital health advisory group

Jul 08, 2026 |

By Claire Cameron , Adam Kovac

| Scientific American

The U.S. Preventive Medicine Task Force is an independent group that offers guidance on what health screenings and medications health insurance should cover After overhauling a key government vaccine advisory panel to include vaccination skeptics, Health and Human Services Secretary Robert Kennedy, Jr. is reportedly preparing to name new members to the U.S. Preventive Services Task Force (USPSTF)—an independent group that helps guide recommendations for services such as cancer screenings and...

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Why “Neil the seal” is unleashing chaos in Tasmania

Jul 08, 2026 |

By Jackie Flynn Mogensen , Claire Cameron

| Scientific American

This one-ton elephant seal has gone viral for smashing into cars and infrastructure, but biologists have a more poignant explanation for his behavior “Neil the seal” is a 5-year-old, one-ton, pure chaos Southern elephant seal . Rampaging around towns on the Tasmanian coast, Neil has stolen hearts even as he has been spotted overturning road posts, ramming into cars, sleeping in residential areas and blocking traffic.

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The Earth is dragging spacetime around its orbit, just as Einstein predicted

Jul 08, 2026 |

By Lee Billings

| Scientific American

A best-yet measurement of one of general relativity's most mind-boggling effects is “another feather in Einstein's cap” More than a century later, scientists are still proving Albert Einstein right. The famed physicist's revolutionary general theory of relativity debuted in 1915, positing that gravity can be understood as objects falling along the curvature of spacetime.

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Detecting hidden nuclear weapons in space may be possible using cosmic rays

Jul 08, 2026 |

By Claire Cameron , Adam Kovac

| Scientific American

For almost 60 years, a global ban on nuclear weapons in space has held up. But the growing number of satellites and increasing geopolitical tension has scientists worried the moratorium could fail For almost 60 years, the world's most powerful militaries have agreed not to put nuclear weapons into orbit around Earth.

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Why more extreme rain could mean more shark bites

Jul 08, 2026 |

By Andrea Thompson , Sam Nichols

| Scientific American

As rainfall intensifies with climate change, waste flushed out to sea could attract more sharks, putting beachgoers at risk In the space of just 48 hours this past January, four people were bitten by sharks along Australia's east coast, with a 12-year-old boy dying from his injuries. Just one day prior, record-setting rain soaked the region.

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Scientific American

Jul 07, 2026 |

By Claire Cameron , Adam Kovac

| Scientific American

Steel support columns in the Midtown building, which is being converted from offices into apartments, may have been overloaded, experts say The evacuation of a skyscraper in Midtown Manhattan and the surrounding area on Tuesday after the building showed signs of potential collapse may have been caused by overload, experts say. The New York Fire Department (FDNY) said in a statement on Tuesday that it received a call to the building just before 8 A.M. EDT.

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How math helped the Allies win World War II

Jul 07, 2026 |

By Manon Bischoff

| Scientific American

During World War II, statistics helped the Allies estimate the number of enemy tanks, which proved essential in the decisive move against Nazi Germany This article is from Proof Positive , our friendly math newsletter that's delivered to your inbox every Tuesday afternoon. Sign up today and read it first.

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Exclusive: International timekeepers to vote on changing the leap second to a leap hour

Scientists get clearest view yet of a spreading seafloor

Can we stop El Niño before it starts?

RFK, Jr. is turning his attention to another vital health advisory group

Why “Neil the seal” is unleashing chaos in Tasmania

The Earth is dragging spacetime around its orbit, just as Einstein predicted

Detecting hidden nuclear weapons in space may be possible using cosmic rays

Why more extreme rain could mean more shark bites

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How math helped the Allies win World War II

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