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somewhere else on HN this was posted recently:

https://learngitbranching.js.org/

I've known git for years but anything more than push, pull, clone, merge, commit, and add I didn't really touch. This webapp definitely helped expand my git knowledge


I am very sad to see Vidme go. I loved the honesty of this blog post, it really shows that they are aware of the independent video scene and why it is almost impossible to compete with the giants (YouTube, and now to my knowledge, instagram).

I always wanted them to succeed, but there was always something telling me that success would be unlikely. YouTube is Google's big loss leader; they seem to exist to keep Google's large internet presence and to keep people connected to the Google ecosystem. If Google can't make YouTube profitable, it seems highly unlikely that a startup would be able to.

It's interesting how Vimeo is still in the game during all of this. They exist because they have a foothold onto the creative/indie/premium video scene. I'm sure vidme was looking for a similar foothold; an niche audience that YouTube/instagram/vimeo had not captured.

I hope the best for their new project. Also kudos to them for advertising those they are not taking onto the new project.


Calculations that youtube is an unprofitable loss leader make the assumption that google pays retail rates for bandwidth. Google is peered with virtually every transit network and ISP on earth, and pays (in relative terms) virtually nothing.

Its a near certainty that youtube is infact massively profitable.


hey Clifford, inspiring work and great article!


I have been working on a multiplayer game as of recently

https://puzzlequest.herokuapp.com/

move with arrow keys, attack with "A"

there's a ton to work on and I've been busy with other things, so sadly the game has taken the back seat. Hopefully I'll be able to put more time into it next month


what's their stack?


If curious, I did a post on that a while back. I'm settling into a new house and will pick this series back up soon.

https://nickcraver.com/blog/2016/02/17/stack-overflow-the-ar...


Web Server: IIS, Database: SQL Server, Web framework (backend): ASP.NET/MVC. Additionally: Redis, Elasticsearch, HAProxy (all on Linux). jQuery on the front end (with some TypeScript) and LESS -> CSS.


wow incredible! i hope they do the LM next!


Scanning the Lunar Module would be slightly more difficult.

The lower half of Apollo's 11 LM (the "descent stage") was left on the surface of the moon at the landing site, and the upper half (aka "ascent stage", which rendezvoused with the Command Module) was jettisoned and left to crash back on the surface of the moon. The exact current location of the ascent stage, however, is officially "unknown".

Source: http://nssdc.gsfc.nasa.gov/planetary/lunar/apolloloc.html


Note that the lunar module currently on display in the Smithsonian (LM-2, an Earth-bound test article) was in fact reconstructed to match the Eagle (LM-5, used on Apollo 11) as closely as possible. It's not the original -- as you say, that would be difficult -- but I'd still be happy to see a scan of the LM sitting in their lobby.

https://airandspace.si.edu/stories/editorial/curator’s-dilem...


Yes, a scan of LM-2 is better than nothing.


one of the most essential pieces of software in my opinion:

flux: https://justgetflux.com/

and now that I've been running linux, redshift: http://jonls.dk/redshift/

I find it hard to use a computer without these now


I'll vouch for this as well. A cool test: a few hours into the later parts of a long night when your working on something, try removing flux. I was blown away by how clearly this app should be a necessity for all devs and possibly techies


I have Flux on a 1 hour shift, so I don't notice the colors changing as it happens, but it absolutely makes a huge difference. Disabling it at 10pm after a few hours of 'flux-ed' viewing feels like staring directly into the sun.


I seem to be the only one that Flux drives crazy. I know it's just my perfectionism speaking, but ... I just want to know if I'm alone in the world in my criticisms. In the past I've been stuck with old broken monitors that made certain colors look wrong or blend with similar colors, and I remember the beauty of seeing the same applications and websites render correctly on a good monitor. When I see a friend's monitors with the colors off, I feel that same feeling I get when you go to a relative's house and find them sitting around the TV with both letterboxing on and an incorrect aspect ratio (apparently it's possible) like barbarians. In the past I've had friends work on some page CSS and come up with something where parts of the text had arbitrary colored off-white backgrounds in the middle of a white page. I ask how they missed such a mistake, and then when I look at their screen you can't even notice it behind the oppressive yellow tint.

I'm sure if I ever do somehow see the light and accept Flux into my heart some day, with my luck right afterward there's bound to be some hip new product that claims that looking at an over-abundance of parallel and perpendicular lines keeps you awake longer or is otherwise minisculely unhealthy, so the product applies small distortions to the locations of everything on your screen, and people designing while they have it on will inflict similarly-jumbled messes upon their own users...


flux&al adjust colour temp, but be very kind on the backlight any time of the day. Some screens are so stupidly bright it's like staring at a bright bulb all day long. If at all possible use a screen that adjusts backlight automatically according to ambient light. And no, you really don't need that much brightness, just don't turn it all the way down either!


Do you know any good automatic-adjustment add-ons? I'd like to use the OS X option, but it seems to automatically adjust to ~2 notches above what I want. So something to use the same relative changes, but a lower absolute brightness, would be perfect. Right now I just do it by hand.


I think OS X built-in setting work just like that. I.e. turn on automatic brightness, then move slider to make screen dimmer.

I've just tried making the screen really dim, then pointed flashlight onto light sensor. The screen went super bright, but after turning flashlight off it got back to my dim setting.


Redshift does not only set color temperature, but also screen brightness and gamma.


Whenever I'm not using flux, it feels unimportant. And then I turn it on, darken it, and I can actually feel my focus relaxing.


Flux has been awesome for me, I've been using it for a long time. Redshift more recently, but does a good job too. Twilight for Android is a very nice counterpart for my phone.


Just installed redshift, and once I had hit "locate" and applied it, wow. I was very skeptical, but my eyes already appreciate the color change.


f.lux was pretty life changing for me when I first tried it, but I'm uncomfortable with the fact that it is free-with-no-ads-yet-closed-source. That's just ... odd. Eventually, I uninstalled it and instead just started going into System Preferences by hand when it gets late in the day and switching color profiles (which is all f.lux seems to do anyway) to something that is based on a lower white point. In my admittedly unscientific testing, it seems to have the same effect as f.lux, which is what I would expect.

I hope Apple releases Night Shift for macOS soon and then I can stop manually switching color profiles around, but for now it's not a big deal.


Flux is awesome, I even use it on my led tv


other than style what else do you look for when you check out a code base?


Depends on the job. Some considerations:

- your intent: playing around to learn, creating something serious, contributing to OSS, etc.

- how far you got

- who is using it?

- solo or collaboration

- how production ready is this?

I suppose you could sum that up with one question: "Where is this on the spectrum between homework and a real product?"

This falls into the topic of side projects, and I wrote about that in detail here:

http://www.madeupname.com/truth-about-side-projects/


are there any unsolved problems in classical mechanics?


Absolutely. A lot of my thesis could be considered classical mechanics (orbital dynamics, specifically). A very old problem that is still open is the question of whether the solar system is stable. (Newton worked on this question 300 years ago.) The state of the art can only reliably integrate orbits for the next few million years. After that, numerical limitations and chaos make it hard to predict exactly what the dynamics in the far future will be. All we can do is make statistical predictions (which we hope are unbiased).

The best predictions are that there is a ~1% chance that two planets will collide before the Sun dies. Here's a nice article:

http://www.scholarpedia.org/article/Stability_of_the_solar_s...


Does this count as having testable solutions?


I remember being told once that we don't have good simulation techniques for predicting the sounds produced by, for instance, the collision of two solid bodies. Lots of work has been done on modeling the kinematics and the optical appearance, but not on the audio side.

I don't know if this is still true.



3-body problem is still unsolved if collisions are involved


there's still interesting issues of numerical accuracy in the point-mass case: E.G. is there a "good" way to calculate positions to arbitrary precision given starting conditions given in arbitrary precision, and what the relationship is.


I think the granular pile problem is still unsolved: Can you predict the cone angle of a pile of granular material given a small set of initial parameters?



I heard somewhere that when we apply all our knowledge to compute the position of the moon, it is a couple of feet off when we measure it, and we don't know why.

I have been trying to find a source for that, but I've failed. Perhaps someone reading this knows? :)


what was your first sale like?


Well, since our beta a few months back, we have had about 180 companies sign up, but all are under the 10 employee limit, which at the moment is free, so we haven't actually had anyone pay for a higher tier as yet.

Of that 180 sign ups, about 30 or 40 are quite active and visit the site often, although it is hard to judge because some only need to revisit the site once a month or so to update details and respond to reminders etc.

We are looking at scrapping the free 10 employee limit soon, and making everyone pay (except the early sign ups - we will honour their free tier pricing indefinitely).


How did you find your first customers?


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