Common sweetener reduces immune response in mice

Hello Nature readers,
Today, we discover the strongest evidence yet that at least one of Venus’s many volcanoes is still active, learn that high doses of a common sweetener reduce immune responses in mice, and hear that the Nord Stream gas-pipeline explosion stirred up long-buried toxins.

Volcano eruption spotted on Venus

Scientists think they’ve spotted a volcano erupting on Venus. Radar images taken 8 months apart by NASA’s Magellan spacecraft in the early 1990s show changes to a volcanic vent that suggest an eruption or magma flow. Venus is covered in volcanoes, and this is some of the strongest evidence yet that at least one of them is still active. Venus doesn’t have plate tectonics that could drive volcanic activity, so it could be caused by heat released from radioactive elements.

Sweetener reduces mouse immune response

In high doses, the calorie-free sugar substitute sucralose suppresses the immune system in mice. The sweetener impairs the rodents’ T cells, immune cells that fight infections. Once the mice stopped being fed sucralose, their T-cell responses recovered. The researchers say that it is unlikely that eating sucralose in normal amounts is harmful to humans. There might even be a bright side for autoimmune conditions: mice predisposed to type 1 diabetes were less likely to develop the condition after consuming the sweetener.

Nord Stream blasts stirred toxic sediment

Explosions that ripped open the Nord Stream gas pipelines in the Baltic Sea last September kicked up long-buried toxins that could threaten marine life for more than a month. It isn’t clear who was behind the explosions, which released more than 100,000 tonnes of methane and threw up 250,000 tonnes of heavily contaminated sediment. The site is a historical dumping ground for chemical-warfare agents from the Second World War. Contaminants — including lead and an endocrine disrupter used to protect ship hulls — were above the safety threshold for more than a month at one site. The full impact on the area’s animals, such as cod and a rare harbour porpoise, is not yet known.

A spell-checker for statistics

A free tool for detecting statistical errors reduces mistakes in psychology papers by more than fourfold. Statcheck identifies errors in P values, a popular statistical measure of how likely it is that any observed difference between groups is due to chance. Statistical errors were reduced by 4.5 percentage points in two psychology journals that introduced clean statcheck reports as a prerequisite to publication, compared with two journals that didn’t use statcheck.

Science needs to fill gaps in high seas treaty

Scientists have a once-in-a-generation opportunity to use their knowledge to support offshore conservation, argues a Nature editorial The United Nations high seas treaty will be the first international law to offer some protection to the nearly two-thirds of the ocean that have few environmental safeguards. But the treaty won’t stop unsustainable fishing practices or deep-sea mining activities, nor will it prevent farming run-off and plastic waste from flowing into the oceans. The international community, supported by the research community, must now work to remedy these gaping holes.

Reframe climate change as an opportunity

Much of humanity’s reluctance to change our ways of doing things in the face of climate change comes from the assumption that it means trading abundance for austerity, writes historian Rebecca Solnit. “But what if it meant giving up things we’re well rid of,” she asks — from contaminated air to feelings of doom. This could be our chance to rethink wealth to consist not of money and goods, but of things like environmental and societal security.