ETH Zurich researchers built a new model showing low-CO2 concrete's lifespan depends heavily on local climate, not just the mix itself. Testing three concrete types across four cities, they found moisture drives steel corrosion far more than differences between mixes, with steel rusting up to 100 times faster in wet concrete than dry.

Even cities with nearly identical rainfall produced very different corrosion rates, since how quickly concrete absorbs and dries mattered more than total precipitation. Current durability standards group climates together in ways that miss these differences, suggesting concrete choice may need to match local weather rather than follow one-size-fits-all rules. The model still needs testing on real buildings before it can shape construction standards.

If you have spent any time on political Twitter or Reddit, you have developed a sense for the post that goes too far. The one that reads like a sermon. Where every sentence is dripping in moral condemnation and the argument has disappeared entirely beneath the outrage. Something about those posts feels counterproductive, even if you agree with the underlying point.

A team of researchers at Northwestern and Harvard just confirmed that intuition at scale.

They analyzed 1,621,147 posts across Twitter, Reddit, and 8chan, covering 13 socio-political topics from immigration to gun control to COVID policy. Using word embedding models calibrated against an expert-validated moral dictionary, they measured two distinct dimensions of each post's moral content: moral loading, which captures how morally relevant the post is overall, and moral density, which captures how concentrated the moral language is within the text itself.

The results revealed something called a moral engagement curve. As moral relevance increased, engagement went up. People are drawn to content with moral stakes. But as moral density increased past a specific threshold, engagement started falling. And it fell hard. Posts at maximum moral saturation performed 2.78 times worse than posts hitting the sweet spot of approximately 30% moral density. The most preachy content performed worse than posts with no moral language at all.

"Beyond it, moral saturation is linked to lower engagement," the researchers concluded.

The sweet spot exists on Reddit too. In a dataset of over one million Reddit posts specifically, the same inverted U-curve appeared. The most moralized Reddit content consistently underperformed. Which means the users who feel like moralizing posts are annoying are, in aggregate, correct. And their downvotes are data.