For Krogh, the source of the number, it was a quite reasonable estimate, which was about all that was possible at the time. And it was ‘wrong’ by less than an order of magnitude … compared to the newest estimate. AND an estimate of a truly unimportant number is as good as you can get (or need) in many cases. What’s the total length of all the ice cores drilled since Camp Century? And their total volume is?

Sabine is a very competent physicist. That’s why her viewpoint - right or wrong - is well worth hearing. The fact that the Nobel went to a computer scientist instead says a lot about the state-of-the-art.

Sabine knows her shit. May she coax some physicists into getting back into experimenting… and away from Big Science funding.

Here’s a picture of it while it’s still in the shop. https://inspenet.com/en/noticias/nasa-tests-solar-sail-in-solar-in-orbit/

Haven’t heard about the NASA design yet, but JAXA’s 2010 IKAROS used "Eighty blocks of LCD panels are embedded in the sail, whose reflectance can be adjusted for attitude contro ".

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“Works perfectly” huh? That’s better than most can claim before freezing! ACT NOW! for a BIG discount!

The 2003 event produced the biggest-ever solar flare ever measured, an X45. That year, several BIG transformers exploded in South Africa. This event’s biggest so is 8.7. A lot depends on where it’s aimed at … but anyway , no, we are not prepared.

Wow. It was only after reading comments on this post until that I remembered WHY I was more than happy to leave Reddit behind. Too bad so many of these diseased children moved over here.

It took just one comment: ’ What is “4000ac”? ’ to start the drool-fest.

Got a neuralink? One word you never wanna hear: ‘Oops!’

Yeah! Did that once, many years back. took a couple weeks. Used a ripper program that went out on the net and got all the metadata, saved to a HD (now on the third one). Put the CDs in Logic cases (no-wear), recycled the jewelboxes.

Over time, started to drop album folders into VLC, save the playlists, at ur fingertips.

The year of the four linux desktops, I hope! (I have 3, but two need to go to the landfill).

After the thousands of years of human history I’ve read about, getting rid of competitors seems to have been the primary concern of most of the ruling classes all over the world. Way back to Ur.

But I’m not in the field. My reasoning for posting this: I see news about PFAs a lot, this was fresh to me and I was glad to hear the news that chemists are at work on the problem (many communities in WA have contaminated water). And simply-enough for ‘newbs’ to learn from. I don’t find a ‘technology for experts’ ‘community’ on Lemmy.

Livescience is far from the best source, but I checked that they had a link to the study (Science) in it.

It appears, going by the comments, that others who are not ‘in the field’ were happy to learn about. It’d be great if more people ‘in the field’ would post about such discoveries now and then.

The balloon + helium has to be lighter than the (couple of liters of) air it displaces.

He Density (at STP) 0.1786 g/L

The density of air at sea level is about 1.2 g/L

Another interesting factoid about rare elements: Very little nickel is found in the Earth’s crust. Most nickel has arrived on Earth from meteors. Usually mixed with iron, which held-back the arrival of the iron-age.

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Blaming another business? Hmmm. Sounds like Boeing’s attempted solution.

While they’re written for a YA audience, (doesn’t include me) I read and enjoyed both Little Brother, Homeland, and Makers. Cory’s head is almost always in the right place for me (including at readings.)

AND they might have had miniature cameras in them for the past 20 years.

(The laws against this stuff are almost non-existing. Option left for those of us creeped out by constant surveillance: don’t leave home, unplug that webcam. Demand privacy or lose it.)