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John Garrett

@garrjohn

Former teacher, now an illustrator, sporadic contributor to Skeptical Science. I present on astronomy to schools—the only thing I do that I get asked back for.

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18.11.2024
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Latest posts by John Garrett @garrjohn

Me too. I feel betrayed.

12.03.2026 18:19 👍 0 🔁 0 💬 0 📌 0
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Measurement of a lithium plume from the uncontrolled re-entry of a Falcon 9 rocket - Communications Earth & Environment A plume of pollutants in the upper atmosphere above Germany is identified using lidar observations of lithium concentrations and can be traced back to the uncontrolled re-entry of a specific rocket la...

This was released recently. I haven't had a chance to read it, but it addresses your comment. www.nature.com/articles/s43...

06.03.2026 16:29 👍 3 🔁 1 💬 0 📌 0
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A small choice yesterday had joyful results. Do I climb indoors or outdoors? I turned right (to climb outdoors) instead of left. Shortly after I saw some excellent parhelia: a 22-degree halo, followed minutes later by a circumzenithal arc combined with a partial supralateral arc.

05.03.2026 17:34 👍 0 🔁 0 💬 0 📌 0

Thanks, Paul, for calling my attention to this. A tragic loss. I'm eager for a report on motive.

21.02.2026 17:45 👍 1 🔁 0 💬 0 📌 0

Then add a bank of lithium ion batteries...what could go wrong?

20.02.2026 19:26 👍 1 🔁 0 💬 0 📌 0

I'm trying to illustrate the Mt. Generoso apparatus (~1927) as a prototype particle accelerator powered by atmospheric electricity. This lead me to discover the work of Hermann Plauson who filed patents in the early 1920s for capturing energy atmospheric energy. Sounds dangerous with little reward.

20.02.2026 18:54 👍 2 🔁 0 💬 1 📌 0

bsky.app/profile/nash...
This powerful dance performance thankfully reminds me of what wonderful creatures humans can be, expecially in response to the worst things humans can be.

17.02.2026 15:27 👍 1 🔁 1 💬 0 📌 0
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These people are describing the abduction of their cousin. I know the person recording this and speaking to them. This is outside the Whipple building in Minneapolis (1/10/26), where, according to the videographer, ICE unnecessarily pepper sprayed protesters after one protester threw a snowball.

11.01.2026 00:32 👍 2 🔁 4 💬 0 📌 1
JPG version of NASA's contrail formation guide: charts demonstrating how temperature and humidity at the altitude of flight determines the formation and persistence of condensation trails.

JPG version of NASA's contrail formation guide: charts demonstrating how temperature and humidity at the altitude of flight determines the formation and persistence of condensation trails.

NASA's contrail formation guide disappeared from it's usual link location this past week, probably for not aligning with the Administration's priorities. Same fate met NASA's excellent lesson on making a cloud in bottle. I've preserved both files on my website here: jgscience.org/science/atmo...

22.12.2025 23:43 👍 4 🔁 1 💬 0 📌 0

Just took mine out for a spin yesterday.

16.12.2025 00:08 👍 0 🔁 0 💬 0 📌 0

I often contemplate the evolution of any microbes that may have hitched a ride on this probe, huddling ever closer to the power source, just waiting.

21.10.2025 16:31 👍 1 🔁 0 💬 0 📌 0

I've enjoyed the writings of both you and Jess, very much.

17.10.2025 15:26 👍 1 🔁 0 💬 0 📌 0
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To do my part to make the world a more beautiful place, I've decided to post self-feets instead of a selfies. Here's a self-feet of my son and me about 350 feet up a wall in Red Rock Canyon, NV, a safe place where politics can't follow me.

22.09.2025 19:35 👍 3 🔁 0 💬 0 📌 0

I think the movie was called “Don’t be afraid of the dark” about little prune head creatures that lived in a sealed off chimney of an old house bought by a couple. Only the woman could see the creatures after they escaped the chimney. Still creeped out 50 years later. Never should have watched it.

25.08.2025 01:01 👍 6 🔁 0 💬 0 📌 0

Signed.

12.08.2025 23:50 👍 0 🔁 0 💬 0 📌 0

I enjoyed your article. Thanks.

09.08.2025 04:28 👍 1 🔁 0 💬 0 📌 0

Are all the cards post marked from different locations? It has the look of a school classroom project, or nursing home project..

28.07.2025 20:58 👍 8 🔁 0 💬 1 📌 0

I apologize. I didn’t mean to advocate theft. I assumed there is only going to be one of these and I lament that I’m unlikely to be the one who would have it. Poor words on my part. Again, sorry.

22.07.2025 17:52 👍 1 🔁 0 💬 1 📌 0

This is one of those favorite things of the day, maybe week. I wish it could be easily copied.

21.07.2025 20:47 👍 0 🔁 0 💬 1 📌 0

Is this woodbine? It's been awhile since I've observed plants I know from the Midwest.

21.07.2025 14:58 👍 2 🔁 0 💬 0 📌 0
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Here's some survival skills advice from someone who spends his weekends hanging off cliffs on safety bolts installed by people he's never met.

09.05.2025 17:11 👍 6 🔁 0 💬 0 📌 1
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A horned toad lizard I observed today in chaparral of Southern California.

01.05.2025 00:25 👍 5 🔁 0 💬 0 📌 0

Fantastic. Thanks for sharing

23.04.2025 23:43 👍 1 🔁 0 💬 0 📌 0

Disturbing, as always. I wonder if there’s any data showing rates of autism among unvaccinated populations.

22.04.2025 00:27 👍 1 🔁 0 💬 0 📌 0

I’m trying to tag this post so my daughter can see it. Forgive my clumsiness as I try to figure out how. @empgarrett.bsky.social

27.03.2025 21:50 👍 3 🔁 0 💬 0 📌 0

I just sent you a gif animation. I think it will turn out well when I add more scenes and polish the timing.

Question:Emma wants to send Rene an email but wants to verify from Rene that Emma can use the email Rene used to sign up for Emma’s blog.

24.03.2025 02:18 👍 1 🔁 0 💬 1 📌 0

Can I opt to receive my DOGE dividend in the form of 30 pieces of silver? Asking for a friend.

20.02.2025 20:43 👍 6 🔁 0 💬 1 📌 0

Good article. Iowa is my birth state, so it will always be home. I appreciate the work you do calling out water quality problems. Your book has been quite the page turner.

26.01.2025 16:22 👍 3 🔁 0 💬 0 📌 0
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Nevada red rocks. Next to Las Vegas. Best climbing area ever

22.12.2024 22:44 👍 2 🔁 0 💬 1 📌 0

Looking forward to that. I just ended a weekend of climbing at Red Rocks

22.12.2024 21:38 👍 1 🔁 0 💬 1 📌 0