Alexandra Witze

@alexwitze.bsky.social

Science journalist and correspondent for Nature (she/her). Opinions = my own. Reach me at alexwitze.01 (Signal), witzescience (@gmail.com), or awitze (@protonmail.com).

Firefighters in Oregon, Spain, and now France (?!) are battling wildfires big enough to generate pyrocumulonimbus clouds. These fire storms are treacherous on the ground. But scientists are concerned about the *planetary* consequences of injecting so much smoke into the upper atmosphere...🌍🔥🧵

This image shows a pyrocumulonimbus cloud rising from the 2022 Mosquito Fire, burning near the Middle Fork American River and Foresthill, California, taken in the afternoon of September 08, 2022.

What do you do after you've been to the Moon and back? For the #ArtemisII astronauts, it means public speaking until the heat death of the universe. Oh, and training the Artemis III crew. I took a look at post-spaceflight astronaut careers for @nature.com (free to read, just provide your email)🧪🛰️

Here’s what’s next for the Artemis II astronauts

Newfound fame has proved to be stellar for some astronauts but harder for others. Will NASA’s popular crew need some space?

nature.com

NIH grants have been under political scrutiny since early 2025. But what does the screening process actually look like? What is being flagged? I spent a month digging into leaked docs and emails. We've published the 235-word list that are being flagged by an internal AI tool. And so much more. 🧵

Inside the new political screening that’s stalling NIH grants

Mandatory reviews by top health officials and checks for 235 disfavoured terms have left hundreds of vetted grant applications in administrative limbo.

nature.com

🔴 We have a fun thing for you today in @nature.com - a game! We took the latest research into Mars terraforming and transformed it into an interactive adventure. 🌿 How would you make the red planet green? Try your hand and see if you can win. 🧪 www.nature.com/immersive/d4...

Can you terraform Mars? Try Nature’s game

Once the realm of science fiction, the idea of making Mars habitable is gaining traction. Nature consulted with key scientists to develop this experimental adventure.

nature.com