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Maurycy's Blog

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A rant about phishing: It's not the user's fault (and not DNS either)

"For safety, don't click suspicious links" Meanwhile, most organization's login flow redirects through: # This is a real example, but I've changed the names to avoid pointing fingers https://www.[name of company].com/squawk/ https://login.[name of company].com/ https://...

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Technical note: transfer files over an ethernet patch cable

It's possible to just connect two computers together with Ethernet and do a bit of IP configuration: # On sender... ip address add dev eth0 fd42:dead:beef::1/48 ip link set dev eth0 up # On receiver... ip address add dev eth0 fd42:dead:beef::2/48 ip link set dev eth0...

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Uranium from Příbram (Czechia)

All images are links to high quality versions. RC-102: 1.7 kCPS [43 uSv/h]. AB+: 55 CPS, 1960 CPS Uraninite nodules in calcite (?). Unlike the Colorado plateau rocks, the veins are nice and clean (although not chemically pure) which results in ...

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You have been mislead about lightbulbs

There's a story that goes something like this: In 1925, lightbulb manufactures secretly colluded to standardized lifespans at 1,000 hours. They would test each other's products to ensure compliance. This is true. At the time, many bulbs lasted longer than one tho...

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Regressive JPEGs:

One of the cool features of JPEG files is that there's the option to save low frequency components first. This means that a partially downloaded image will be displayed at low resolution instead of being cut off. In the file, this works by breaking up the compressed data...

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NGC 7497, etc.

North is up (aprox). 0.53 "/pixel. [24' x 23' field] FWHM = 3.75" A relatively unremarkable spiral galaxy... but hey, what's that in the background? Click to toggle annotations. (needs JS) Well, it's not actually in the background: the nebula is closer than the gal...

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Making cooled clothing:

So, summer gets really hot, and it's not going to get better anytime soon. At my place, it isn't actively dangerous yet, but it's still unpleasant. A normal air conditioner uses a low boiling-point liquid: something like liquid propane will boil all the way down to -42 ...

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The Tadpole galaxy:

North is up (exact, mirrored). 0.53 "/pixel [18.8' x 7.4'] FWHM = 4.2" This galaxy has a massive (and rather bright) tidal tail, but I can't see an obvious companion galaxy. The general consensus is that there's a second galaxy behind it... although a nearby elliptical...

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Arp 90

North is up (mirrored, exact). 0.53"/px [15' x 9.2' field]. FWHM = 3.9" Arp 90 is the two interacting galaxies in the east. The west of the image has a wierd distorted galaxy (?), with a similar redshift to the interacting pair. This means it could be a tidal fragme...

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Stephan's Quintet

North is right (mirrored). 0.53"/pixel [17'x12' field]. FWHM=3.7" Ok, this is a crazy one. Five tightly spaced galaxies with visible tidal interactions: However, looking at redshift data, the blue spiral on the left is ten times closer than all the other objects:...

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Arp 38: not that peculiar

Data is from 2026-06-20. North is right. 0.53"/pixel (27'x27' field). FWHM=4' A nice, if rather small (~100") edge on spiral galaxy. Arp filed this one under "low surface brightness companions", but the companion doesn't seem to exist. There's a bright spot to the...

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Arp 293: More interacting galaxies

North is right. 0.52"/pixel (18'x9' field) FWHM=4.5" The pair of galaxies near the center is NGC 6285 (top) and NGC 6286 (bottom). The lower one has a distinct tidal trail below it, and a faint bridge to the upper galaxy is visible. Both sit around z=0.018. The edge...

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Glassblowing #3: A better thermionic diode

My last attempt at a vacuum tube technically worked, but not very well because there was a lot of glass between the anode and cathode: Because of this, many any electrons that miss anode and build up on the glass. This negative charge will keep accumulating until it's...