Hello Nature readers,
Today we boggle at samples from Earth’s mantle — just when an international exploration effort is coming to an end. Plus, we consider the debate raging in the field of high-pressure superconductors and explore the microbiome in our microwave ovens.

Deepest-ever samples from Earth’s mantle

Researchers extracted an almost uninterrupted 1,268-metre long sample of rock from a region where Earth’s mantle — the thick, interior layer that makes up more than 80% of the planet’s bulk — has pushed up through the Earth’s crust. The oceanic crust is an ideal place to puncture, because it’s much thinner and younger in places than the crust on dry land, thanks to the movements of tectonic plates. But a follow-up study might be a long time coming: the United States is retiring JOIDES Resolution, the workhorse research ship that scientists used to do the work.

Superconductivity still reels from scandal

The high-pressure superconductor field is still recovering from a scandal in which physicist Ranga Dias claimed to have discovered room-temperature superconductors, but then was found by his employer to have committed extensive scientific misconduct. Now there are fresh concerns, this time about results from the laboratory of physicist Mikhail Eremets at the Max Planck Institute for Chemistry in Germany. In 2015, Eremets announced a stunning discovery that the compound hydrogen sulfide is superconducting up to 203 kelvin (–70 °C) — positively balmy compared to the unimaginably cold temperatures at which most other materials superconduct. But a dust-up over the data in a 2022 paper by Eremets and his colleagues raises an existential question about how science should be conducted in a community already in turmoil.

Blood test uses ‘protein clock’

An age ‘clock’ based on some 200 proteins found in the blood can predict a person’s risk of developing 18 chronic illnesses, including heart disease, cancer, diabetes and Alzheimer’s disease.
The clock’s accuracy creates the prospect of developing a single test that could describe a person’s risk of many chronic conditions, says the project’s lead scientist Austin Argentieri, a population-health researcher. “Ultimately, wanting to live longer will come down to preventing chronic diseases,” he says.

Read this, then clean your microwave

Your microwave oven probably has its own microbiome — challenging the common misconception that microwaves make food safe by wiping out bacteria. Microbiologists swabbed 30 microwave ovens, and discovered 101 bacterial strains. Most were bacteria found on human skin, but some were associated with food-borne illnesses. In laboratory microwave ovens, researchers found ‘extremophiles’ that can withstand high radiation and high temperatures. The team suggests that these strains might have been ‘selected’ evolutionarily by surviving repeated rounds of radiation, and could turn out to be useful — for the bioremediation of toxic waste, for example.

Time to axe ‘zombie’ wildlife conventions

A moratorium implemented by the International Whaling Commission (IWC) has stopped almost all commercial whaling since 1985 — a groundbreaking achievement that saved species from extinction. But the convention has outlived its usefulness, argue former IWC chair Peter Bridgewater and three other researchers. “IWC meetings since have been a source of acrimonious and fruitless dialogue among member nations,” they write. “By exiting with dignity, the IWC would set a powerful example for the international environmental community.”

Diversity, one qubit at a time

A raft of initiatives is rising to the challenge of drawing more scientists from under-represented groups to quantum computing. “What I find really exciting about emerging technologies like quantum computing is we have the chance to get things right early on,” says Kiera Peltz of Qubit by Qubit, which aims to make quantum-computing education more accessible. “Quantum computing will most certainly impact society, and I think that makes it even more critical to have diverse voices and experiences shaping these technologies.”