Sunday 24 September 2023

Let's not ban words :(

 Recently at work, a team launched an internal tool. It's a great, well done tool, and the team got a lot of congratulatory responses on the launch email. Then after a day or two, the launch email got a reply from the original author, apologizing about the naming choices, and that they'll be renaming the tool with immediate effect.

I was very puzzled, I hadn't seen anything wrong with the name. It turned out the bad naming choice they'd made was to include the word "guru" in the name. Per Wikipedia

Guru (/ˈɡuːruː/ Sanskrit: गुरु, IAST: guru; Pali: garu) is a Sanskrit term for a "mentor, guide, expert, or master" of certain knowledge or field.[1] In pan-Indian traditions, a guru is more than a teacher: traditionally, the guru is a reverential figure to the disciple (or shisya in Sanskrit, literally seeker [of knowledge or truth]) or student, with the guru serving as a "counselor, who helps mold values, shares experiential knowledge as much as literal knowledge, an exemplar in life, an inspirational source and who helps in the spiritual evolution of a student".

This is consistent with the meaning of the word I grew up with in India. However, the English word Guru, even if borrowed from Sanskrit, has come to mean more like an expert, and in that sense, the use of the word made perfect sense to me. We have Gadget Gurus, Car Gurus, etc. Whether this is a good thing or not, I don't know. It is definitely an established meaning of the word, and not at all offensive to me or most Indians I know -- we use the word in the loose sense all the time. We even have frauds who use the word to describe themselves as superior-to-you, but hey, I too get to call myself what I like, so what gives.

What irritates me the most is that some people (sometimes not even Indian!) feel the need to be pained at the potential hurt that might be caused to the entire community of people identifying as "Indians" by the usage of a common word intended to describe something completely legitimate.

Replace Indian with Black, LGBTQ+, or any other group it is fashionable to pretend to understand the pains of today, and it usually holds: Maybe this is too cynical, but it has been my observation.

 Last year, Stanford also tried to ban a bunch of words in their IT comms. They had to take it back after a backlash from people on and off campus. That guide suggested using the following words instead of Guru: expert, subject matter, expert (SME), primary, leader, teacher, guide. And the "context" for that is given as:

In the Buddhist and Hindu traditions, the word is a sign of respect. Using it casually negates its original value.

It does not "negate" anything, when used in the context of our traditions, the word carries the weight it deserves. My Dhrupad Guru is not just an expert/teacher for me. But a dude who claims to be a Gadget Guru can have it too, I assume he knows a bit about tech gadgets, good for him.

Banning words to please a section of powerful people who pretend to feel sad for others who might be offended is not very wise. It is a slippery slope that must be avoided to maintain a free thinking society. I do think there are legitimate reasons to restrict use of certain words, e.g., those which symbolize oppression of a community. But usually, we don't need a messiah from outside those communities for that. In fact it is quite offensive that people think we cannot handle a dude calling himself Gadget Guru.

There is plenty of actual useful work to be done to help communities in need, banning words is usually not high on such lists.


 




Friday 22 September 2023

Indian Subcontinent edition

I grew up in Kolkata (aka Calcutta), India. The word "textbook" evokes the image of a usually thick, small, tightly bound paperback book with really thin pages of rough paper, and usually unaligned printing. These are very hard to turn or keep open, so we'd usually have to bookmark by folding pages.

Some of these books were published locally (e.g., the very popular math books from KC Nag), but some of them were not, and these too had the same, relatable (now nostalgic) quality of paper and print. In contrast, when I see textbooks in Europe, I subconsciously associate them to glossy magazines :) Beautiful colour charts and graphs; glossy, thick, amazing-to-feel paper (Makkhan, as we'd say in Hindi).

I'd never thought about this before, but now the Indian Subcontinent Edition - For sale in India, Bangladesh, Pakistan... notice on most of these books makes sense. I am grateful for having had access to awesome books produced at an affordable price. At this point, their feel is nostalgic, but since our schools required us to lug the required books to school everyday, I can imagine how painful it would have been to instead carry the magazine-like textbooks that IMO easily weigh 1.5-2x more than our "Indian Subcontinent editions".

Thursday 21 September 2023

Acceleration due to Earth's rotation on its axis?

 I'd never thought about this before, but once you calculate it, it is very small compared to g, the acceleration due to gravity:

The average circumference of the planet is about C = 40000 km.

Average speed of a point on the Equator due to this rotation V = 40000 / 24 km/h ~= 1700 km/h

Average radius of the Earth is approximately R = 6000 km, so the centripetal acceleration of the Equatorial point traveling at the tangential velocity of V is (V^2 / R) ~= 480 km/h/h ~= 0.04 m/s/s.

This acceleration is directed towards the center of the Earth, and is balanced by a fictitious force that goes in the opposite direction, making objects ever so slightly lighter.

However, this  centripetal acceleration is very small compared to the acceleration due to gravity which is about g=9.8 m/s/s, which is why we don't "feel" it.



Wednesday 20 September 2023

Ganesh and modak and the galaxy

 Childhood memories of Ganeshotsav are some of the fondest I have. We grew up with not much, but these 10 days of the year were special as kids. Rules were relaxed, parents were in good spirits, amazing food to be had, various competitions and activities.

Yesterday was Ganesh Chaturthi 2023, and my wife made Modak at home for the first time. We then did a small cleanup, lit diwa and udbatti and had a good time. I am not religious, but cannot deny the atmosphere was very nice :) Any excuse for spending quality time together is good, and this one came with fond childhood memories.

Ganesh is the deity of new beginnings. In that spirit, I learned a bit about the Big Bang today. It is mind boggling that all matter we can interact with today is made in a window of about 9 minutes, about 10s out from the Big Bang. Most people take more time to make their chai/coffee in the morning.

The swirl of foam on top of my drink today makes me think how cool it is that we figured out our galaxy is spiral. When I started looking into it, it is not at all clear to me how that conclusion is reached. So far, I have these links that have good pointers:

 These point to a bunch of new concepts, but I want to figure out how it is all put together to arrive at 4-arm spiral shape of the galaxy we are embedded in. Vaguely, and maybe incorrectly, I think this has to do with observing the "21cm" radiation that neutral Hydrogen emits rarely, using it to build a distribution of where this H is concentrated.

Tuesday 19 September 2023

Starting physics with the Open University of UK

 I'd been wanting to do this for a while, and here we are, I enrolled for the integrated Master of Physics degree at the OU. The studies formally start on Oct 7 2023. I've got 16 years to complete the whole thing. The whole thing is divided into "modules". Once you pick a module, you've got to finish it by the stipulated time by taking the various assessments and the final module exam.

I'm doing the "advanced math start", and starting with a basic math module (MST124) and a basic physics module (SM123). Both seem pretty well-structured, the former even comes with fancy printed books. For someone who grew up with "Indian Subcontinent edition" textbooks, these books are Makkhan :)

Today I was working through what I thought was very easy stuff - significant figures and rounding. But it turns out it is not that easy (but is very interesting!). For instance, I did not know that 0.360 and 0.36 differ in the number of significant figures. The Wikipedia page on the topic is really good.

As pre-work, I've also been going through the Feynman Tips on physics, which is such a bounty of ideas. A cool thing I already learned there was the trick to quickly differentiate any expression, even if the result would need significant algebraic simplification.

My motivation for doing this is just that I enjoy the knowledge and solving math problems. While I could have done a self-paced study for much, much cheaper (A typical module costs close to 2k CHF, and I need about 16 of those for the entire thing), I figured I enjoy a structured syllabus, a community and the idea of "formally" completing a qualification enough to justify the spend.

The main challenge is fitting studies around my schedule. My job isn't easy, I have many hobbies, and there's my first baby coming next year :) I think that studying one module at a time is totally doable (8-10h of weekly study), especially if I cut down on some of my tail hobbies. I picked two modules in the beginning because a lot of the material like trig, basic calculus is already known (even if rusty) to me thanks to my engineering studies.



Thursday 14 September 2023

What's the disco light in the autumn sky?

 We were in Solta, Croatia, when we looked up at the clear sky to see a start twinkling red-blue, like a disco light. I pulled out the Sky Guide app to see that this was Capella. I knew that stars appear to twinkle due to their light being refracted by our turbulent atmosphere before hitting the eye. But this particular star happened to be twinkling more than just about anything. We were wondering why.

It turns out that stars lower in the sky will twinkle more. Capella (which, TIL, is actually a star-system made of four stars!), starts low in the Northern evening sky. That way, the starlight has to travel more atmosphere before reaching us, which is responsible for the fabulous display of colors. Different wavelengths of light get bent in different angles by pockets of air with different densities, and as the atmospheric air moves around, we get to see different colors.

Capella eventually moves higher in the sky, and the disco effect is less pronounced just before dawn.

Welcome, daughter

  We had our first baby today. One month ahead of schedule. In the last 24h, My wife woke me up at about 03:00 and said she was stressed bec...