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When Apple unveiled its upcoming software updates at WWDC 2026 on June 8, we didn't really get much on macOS 27 — aside from an animated skit about how the Golden Gate name was chosen. But having given the operating system a trial run, I can report that there is in fact a lot to look forward to.It's worth emphasizing that installing the developer beta is risky: it's no exaggeration to say it can potentially brick your Mac, or at least some of its apps. Unless you're sure about this, you should wait for the public beta in July or the full release of the software sometime in the fall (for the northern hemisphere).Just because I haven't come across any problems in my testing doesn't mean it'll be the same for you, but I can tell you that I'm impressed by what I've experienced so far. This is still very much a work in progress from Apple of course, so don't treat this as a review — features may come and go before it's pushed out to everyone.As for compatibility, macOS 27 Golden Gate leaves Intel Macs behind. You'll only be able to install and run this if you're on an Apple Silicon machine. Here are my three favorite things about it so far.1. It's smooth and fastmacOS 27 is just one of several software updates on the way from Apple (Image credit: Apple)Apple has promised performance upgrades with macOS 27 — though it's been a little vague on the details — and while I haven't run any benchmarks, I'd say my MacBook has felt noticeably faster and snappier. Perhaps Apple is taking advantage of not having to take Intel chips into consideration any more.Other users have noticed the speed increases too, and it seems that high performance tasks are particularly benefitting from this. Even though I don't do much beyond writing, web browsing, and photo editing, I've seen less in the way of lag and sluggishness than I did before, which bodes well.These performance gains should hopefully translate into battery life improvements as well, though I haven't noticed any real change in terms of time between charges. Bear in mind that there are still months of development to go on macOS 27 Golden Gate, so it's likely to get better over time (this is still only the developer beta, after all).2. Siri AI is a genuine upgradeSiri AI is actually good now (Image credit: Apple)I have to mention Siri AI, which is now up and running on my MacBook. With a little bit of help from Google and Gemini, it feels like Siri is now genuinely useful on the desktop: answers are accurate and informed, relevant, and personalized to you.One of the most helpful upgrades is the way that Visual Intelligence now works on macOS 27. You can highlight anything on screen (Shift+Cmd+Space is the shortcut you want), and then ask Siri something about it — and the assistant then uses clues about what's on screen and image recognition to serve up an answer.It's the sort of feature that should've been in Apple Intelligence from the beginning, but at least it's here now. In addition, the dedicated Siri app and the integration with Spotlight works really well too, making the AI more accessible and more versatile.3. The interface tweaksSeveral welcome interface tweaks have been added (Image credit: Apple)There are numerous interface tweaks here that aren't major on their own, but which all add up to make a significant difference. Even something as simple as having an overflow button for menu bar icons is really effective — it means if you've got a lot of them, they won't start disappearing behind the notch.The Liquid Glass slider has been given a lot of attention, and it works as advertised. You can find it in the Appearance section of System Settings, and I've moved it all the way to the right — it's as little transparency as possible for me, please. I'm actually hoping Apple gives us more control over this in the final release.As we've written about before, the icons that were plastered all over app menus are gone as well, leaving behind an interface that suddenly seems more elegant and clean. This isn't a user interface revamp by any means, but it feels as though Apple's engineers have thought long and hard about what changes to make.

Plants, insects, and larger animals, like the forest’s white-faced capuchin monkeys, are well adapted to these changes. But in 2015, during an abnormally severe drought influenced by the El Niño–Southern Oscillation (ENSO), Perry, an evolutionary anthropologist at the University of California, Los Angeles, observed behaviors that once seemed impossible.Under normal conditions "The [capuchin] mothers are quite devoted," she explained. "Now, I was seeing babies crying on the ground piteously. And the mothers just looking down like 'Too much trouble' and walking off, abandoning their infants.""Even capuchins have their limits," Perry said. "And we need to start paying attention because all the weather predictions are saying that we're going to get more unpredictability and more climate extremes."Monkeying aroundOdd Jacobson, a behavioral ecologist at the Max Planck Institute of Animal Behavior, was a student at Lomas Barbudal in 2016, a year after this severe drought. His focus was on understanding how the study site's 12 different capuchin groups were moving through the forest. But now he's set out to investigate how else climate extremes may affect the behaviors and social structures of these monkeys.In a paper published in Nature Ecology and Evolution, Jacobson and his coauthors — including Perry — analyzed how climate variability correlated to the 33 years of geolocation data they had on the capuchins.Their first step was understanding how the size of each group was affecting the relationships between monkeys within the same group. To do this, they observed variables such as daily fruit intake, the size of the group's home range, and the distance the group traveled each day to find food.Finally, to understand how monkey groups interacted, they used a "hierarchical social relations model," which allowed the scientists to predict how two different monkey groups would move through the forest and where their territories would overlap.The team repeated this process, two monkey groups at a time, until they analyzed the interactions between all 12 monkey groups at Lomas Barbudal. Then, they added the climate-over-time layer to predict how the home range overlap and encounter rates (meaning moments where capuchins from two different groups engaged, often violently) would change with the seasons.Strength (and weakness) in numbersGenerally, large monkey groups have advantages and disadvantages in the forest. One key advantage is the ability to control resource-rich areas, such as land with fruiting trees known as food patches. A key disadvantage is increased intragroup competition for food, meaning the daily fruit intake of individual monkeys was lower.The researchers found that during climatic extremes, such as extremely wet or dry seasons, this intragroup competition intensifies, making the group less efficient at foraging overall. Behavior between groups changed with the climate as well. For example, in a typical dry season, large groups often overpower smaller ones to take over areas with more available fruit, such as along rivers.But the new research found that this long-understood idea doesn't always hold true: During extreme climate events, like a dry season made even drier by the effects of El Niño, capuchins didn't try to hoard the higher-quality areas."We don't really know exactly why," Jacobson said. "Maybe there's not as much heterogeneity in the landscape during these resource poor times, and so there's not much that larger groups can monopolize."Climate extremes, the research suggests, may be upsetting the balance that determines the optimal size of monkey groups. And, as a warming atmosphere makes climate extremes like El Niño or La Niña more intense, it's growing increasingly important to understand how these changes will affect animal societies.Filippo Aureli, an ethologist at the Universidad Veracruzana, in Mexico, was not involved with this study, but he has studied the effects of extreme weather events on spider monkeys in Mexico. He also registered the infant mortality rates of capuchin and spider monkeys in the Costa Rican dry tropical forest during that 2015 drought. Capuchin populations experienced high infant mortality during the extreme event, while spider monkey populations tended to stop reproducing.Related storiesCapuchins have started abducting newborn howler monkeys in bizarre, deadly fadAdorable monkeys caught commiting grisly act of cannibalismLab monkeys on the loose in Mississippi don't have herpes, university says. But are they dangerous?"With climate change, [climate extremes] are going to be more frequent and intense," Aureli said. "And we don't know what's going to happen. For this period [so far], they've held on very well, the spider monkeys, but we don't know for how much longer."Perry agreed, noting "the importance of having a baseline when you're trying to study rare events like El Niño droughts.""We know what normal is," she explained. "If you just try to drop in right now in all the chaos that we're starting to feel around the planet, then you really can't study it."This article was originally published on Eos.org. 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