George Budd @Gbudd@social.cleverlibre.org

The energy produced by fusing Hydrogen into Helium sustains our sun. Larger #stars make successively heavier elements as you go deeper into the core, each new round of #fusion producing #energy. Until Iron. To fuse further would take energy. Once the star runs out of usefully fusable #elements, a core collapse #supernova occurs.

#astrodon #universe #Astrophysics #sciencerocks #science #space #scicomm

Source: https://www.physics.rutgers.edu/analyze/wiki/cc_supernovae.html

Marie Curie's notebooks, which are radioactive and must be stored in a lead-lined box in the Bibliothèque Nationale. Curie’s corpse is also radioactive. Her coffin is lined in an inch of lead. Both will remain radioactive for 1,500+ years.

More info: https://www.sciencealert.com/these-personal-effects-of-marie-curie-will-be-radioactive-for-another-1-500-years

#HistSci #ScienceMastodon #MedMastodon #science #scientist #HistoryOfScience #HistMed #WomenInStem #TIL #TheMoreYouKnow #WeirdHistory

#AdventCalendar Day 5

#CalvinAndHobbes

#Extermintate

#DoctorWho

#AdventCalendar2022

A friend shared this with me. Solidarity! :)

Here I am getting schooled again by @darkvinge's answer to yesterday's Linux DFIR command line trivia question.

How do you output an entire directory structure of file paths, sorted in descending by size? Old-school me would have told you to do something like this:

find /some/path -type f -exec wc -c {} \; | sort -nr

It's an interesting example of one time when you want to use "find ... -exec" rather than "find ... | xargs ...".

But then @darkvinge pointed out that you can just use "-printf" instead of "-exec":

find /some/path -type f -printf "%s\t%p\n" | sort -nr

"-printf" has a huge number of handy shortcuts for different file parameters. Here we see "%s" for file size and "%p" for file path.

This is vastly more efficient than executing "wc -c" on each file. Don't believe me? Check out how long the different find commands take on the same directory structure:

# time find /usr -type f -exec wc -c {} \; >/dev/null
real 4m20.615s
user 2m47.897s
sys 1m37.520s

# time find /usr -type f -printf "%s\t%p\n" >/dev/null
real 0m0.306s
user 0m0.068s
sys 0m0.238s

It's not even remotely close.

#Linux #DFIR #CommandLine #Trivia

logic gate

Microbiologists are larger than one might expect.

"Nothing that grieves us can be called little. A child's loss of a doll & a king's loss of a crown are events of the same size" -Mark Twain
#zen #meditation #quotes

A hotel in Germany uses 3D carpets to prevent guests from running in the passage...

An oldie but a goodie! This is "Anticipation", which I use for my logo. Acrylics on wood panel, 2018. A colorful pet portrait of an orange and white tabby cat in bright rainbow colors! I started a series of dog and cat paintings in 2018 to create a portfolio for my new pet portrait business.

Prints: https://rebeccawangart.com/featured/anticipation-psychedelic-rainbow-tabby-cat-rebecca-wang.html
RB: https://www.redbubble.com/shop/ap/36245309

#Art #MastoArt #FediGiftShop #BuyIntoArt #cat #TraditionalArt #AnimalArt #AcrylicPainting #FantasyArt #ArtAdventCalendar

Create a freeze frame of the action in a video every 7 frames and pause at the end for 50 frames.

mpv --ao=null --vo=image --start=0:1:44.25 --end=0:1:46.6 GUEZCxBcM78.mp4
i=1
for f in 000*.jpg; do
convert -evaluate-sequence Min ${a[@]} $f $f
[[ $((i%7)) == 0 ]] && a=(${a[@]} $f)
i=$((i+1))
l=$f
done
echo 0001{00..50}.jpg |xargs -n1 ln -s $l
cat 000*.jpg |ffmpeg -y -f mjpeg -i - -c:v libx264 -r 24 -pix_fmt yuv420p skier.mp4

People call us stats nerds, but we're really sum of the least squares.

#geekjoke #statistics #data #research

Here's an original (circa 1904) rotary AC-DC converter providing power to the (former) IRT subway in NYC. It still works, and is occasionally pressed into service during times of peak load, though most of the system now uses solid-state converters. It is very loud.

Full version at https://www.flickr.com/photos/mattblaze/32992380451

#photography

55 years ago #today Jocelyn Bell discovered the first known pulsar -- a star the size of a city, spinning once a second, whipping up intense radio signals that sounded like the beep-beep-beep of an alien signal.

In her own words: https://www.cam.ac.uk/stories/journeysofdiscovery-pulsars #astronomy #discovery