When the university decided to move everything over to Outlook. This broke a lot of my workflow and I had to keep track of multiple calendars that unfortunately don’t know how to share. Then, I heard about Sunsama on the ADHD YouTube channel (how to ADHD).
A funny but also true ADHDino comic that captures my struggle with todo lists.
Email is also an absolutely terrible way to keep track of what I need to do. I have many different hats to wear in my job as professor. And frankly inbox 0 doesn’t quite cut it.
Enter Sunsama. I can see both calendars and what is on them. I have a backlog of items I need to do, I can add to this list from any of my devices. Whenever I have a “oh I need to do this” moment, I can add.
Every day I start with the things planned for the day in the various calendars, add items from the backlog and see if I can get through as much as I can.
I don’t pull individual emails into the Sunsama anymore. I have a 30min Burn Time scheduled where I get through as much admin crap as possible. Much less task switching as I go from teaching to grant application to science and scheduling and back.
And my todo list lives in Sunsama. Nowhere else. It has freed up so much executive function it’s unreal. I’m not super burned out after this semester and it was a doozy. Complete superpower. Love it.
This has lowered my reactiveness and stress levels (for work, a lot of other stuff stresses me out still).
It’s not panacea but it works fantastic as part of a larger system. Where I get my time and focus back to do things I want to do. I have enough focus to carefully say no to things. So if I say yes. It’s backed with mental bandwidth.
I’ve been inbox 0 since a colleague showed me almost a decade ago. There has been some pushback but it does help having everything in categories for working on next. The goal of inbox 0 helps me get over the initial resistance of doing some of this stuff. And it’s the stuff I should not let linger.
Oh Outlook. How wrong you are. It's all in task folders.
The trouble is that all the admin, much of it of dubious utility, does need to happen or email is flooded with “follow-up”. Basically university admin is why the book “a world without email” by Cal Newport was written. And inbox 0 may shift your activity to a day filled with vaportasks. Often marked as “high priority” too just so your flight or fight response is triggered something extra. Microsoft Teams/Outlook is especially prone to this sort of messages in its basic design with messages about messages etc.
I was listening to Cal Newport’s podcast and he advises to batch such tasks for a couple of slots in the week, rather than jumping from context to context. And this resonated because the inbox is a mix of tasks, even if it’s the tasks for today or this week, I still do a lot of task switching. It sounds trivial but it’s the kind of jumping around my brain does on its own already and it exhausts me. So if I am forced to jump around, it wears me out faster, and then I struggle more to stay on a single task.
So when Cal Newport talked about different categories he uses, I considered a way to help me beat the incessant drum that is university email. So I have made a new set of categories to put tasks while doing inbox 0:
Admin
Grad Student
Papers to read
Scheduling
Teaching
Undergraduate research
And then there is still “today”, “this week” “this month” and “someday” (let’s be honest that means “never”).
I have scheduled at 1pm “admin” and set a timer for 30min. Burn through as much as I can in that time and importantly not feel guilty about moving on to, you know, actual work.
I am testing this new system now and it is clearing up the mental load that is admin for sure. The real test will be when the fall semester starts in earnest.
No this is not a story from a neighborhood chatgroup. I had a machine Learning question specifically for my science interests. In 2024, I classified galaxies a JWST field using k-nearest neighbor (see the paper here). This is a very simple algorithm where you use a space with a training sample spread throughout and every time you get a new data-point, you classify it as the (weighted) average of the k-nearest neighbors to that new point. The only variables is the number of neighbors (k) and whether or not you want to weigh them with distance. It works well since it will have high resolution where you have a lot of information in the training set and will have to average out in sparser areas.
It worked pretty well. I thought it did the trick in JWST. However, I also want to do this in HST parallel fields and there the color-information is as rich as it is in JWST fields. We get four filters and that is it. Back in 2014 I generated an M-dwarf catalog and in 2016 two students from Leiden modeled the Milky Way from this catalog (2014 paper and 2016 paper). I now want to do this for many more fields available in the Hubble archive.
Enter Yggdrasil, the mother tree (of decisions?)
I read about it on Medium here. This seems to be an upgrade to the standard decision tree algorithm; gradient boosted trees. Here the only variable is how many branches you allow for a decision tree.
So I tried it “out of the box” on the same training set to see if we can do better. Here is where we start with kNN classifying. I have a set of colors for objects and I want to know if these are M, L- or T-type dwarfs and what their subtype is. This is a multiclassing problem. A lot of ML algorithms cannot handle that. But kNN and Yggdrasil GBT can.
The confusion matrix using kNN with k=4 on the JWST and HST colors. We are aiming for getting this right to within a subtype (0.1 type resolution).
kNN is definitely not doing bad! But there is a persistent few misclassifications. How does Yggdrasil do?
The same as above but now classified by Yggdrasil Gradient Boosted Trees.
The difference is not great and this is reflected in the respective precision, recall, F1-score and accuracy.
But call it a hunch, I suspected Yggdrasil could perform a little better than kNN. Or at least I wanted to see if it could. This was with all the information we have on deep fields from both JWST and Hubble.
How well can we separate out by subtype (Delta T)? Here are the metrics by the resolution we are attempting for kNN and Yggdrasil. Very comparable.
The precision, recall, F1-score and accuracy of kNN(k=4) and Yggdrasil on JWST and HST colors combined.
The only thing that really stood out was that Yggdrasil starts out a little better at Delta T = 0.2 and 0.3. I used 0.4 in 2024 for kNN since it was at 80% for all the metrics. Looks like Yggdrasil can do better type resolution!
This is the color-space if we only have Hubble:
The near-infrared colors of stars in Hubble observations. You can see that the different types (M0=0.0, L0=1.0 and T0= 2.0) are separated some but not fully.
So let’s try this with just this Hubble set of filters:
The precision, recall, F1-score and accuracy of kNN(k=4) and Yggdrasil on HST-only colors.
The Yggdrasil performs remarkably like it did with JWST+HST (I got a little suspicious there for a second)
So if you’re ok with metrics at ~70%, Yggdrasil can get to within 2 subtypes with just the four Hubble filters. or 4 subtypes it performs as well as the kNN at ~80%.
Reflecting on this, there is a difference between better (which you feel like is always just around the corner) and good enough. That 10% improvement over kNN at Delta T=0.2 means I can slice the population pretty finely into different brown dwarf types and the 70% accuracy means I have enough of them identified to model the Milky Way distribution? That will be next.
This all started with an off-the wall idea I had following the work by Driver+ 2018. There the emphasis was on the volume densities of some of the main components of galaxies we can infer from their light; their stellar mass, their current star-formation and their dust content.
The neat trick for that paper was to sum the luminosity functions and get a volume density. This was a neat approach as it used a heterodyne mix of surveys, GAMA, G10/COSMOS and the 3D-HST survey for ever increasing distances. This creates some gaps in the coverage as you can see very nicely in Trevor’s first plot:
The complete data sets of GAMA, G10-COSMOS, 3D-HST with stellar mass
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But the mass range 7 to 11 is reasonably covered. The idea I had was to compare the dust masses inferred for galaxies by the SED fits from Driver+ 2018 with those predicted in The Simba simulations. These are good volume and reasonable physics SAMs that seem to be doing a good job on the dust household (including ejection).
The dust mass ranges selected for this study. We plot GAMA/G10-COSMOS/3D-HST data as black dots. We plot the selected data with the ranges applied in green dots with a box surrounding them. The red dotted line represents the dust mass volume limits of the surveys. Note that we exclude GAMA data at z=0.5 due to volume-related issues in the selections. Selection effects were a real challenge.
So we picked four slices in the Driver+ data and compared them to The Simba catalog at the same redshift/epoch. Simple no?
Normalized counts of stellar mass from Simba and GAMA/G10-COSMOS/3D-HST. The observational dataset is separated into individual surveys to highlight the distinctions between them. Trevor figured out how to make these mass functions completely on his own!
And that is what Trevor did! And it worked. Reasonably well. It is of course quite instructive as well to see where itdidn’t work as well. And that occupied quite a bit of Trevor’s time.
And there is some work for the next generations of galaxy evolutionary models. Simba misses dust-rich galaxies for all epochs above z=0 and Simba does not accurately model low-dust mass galaxies at earlier epochs.
I love the Rauch Planetarium at the University of Louisvlle as the place to teach Astronomy in. That probably doesn’t sound controversial to you when an astronomer says so but apparently it is?
A space dedicated to showing the night sky and our Universe gets students already in an astronomy frame of mind. But it goes beyond that. So much beyond that.
Not only can we show how the night sky looks without the city lights or the ever multiplying artificial satellites thanks to Starlink and others mega-constellations. We can show how it looked to ice age hunter-gatherers or people in the Southern hemisphere. That links us all across the globe and along the age of the human race. It also allows me to link what you see in the night sky directly to physics. We have a program that shows the (now familiar) stars in the night sky which then move to their place on the color-luminosity diagram and the class learns the link between temperature and luminosity of stars around us. That kind of linking between sky and physics is what my class is all about. More planetarium resources like this are made available by federal projects like the Rubin Observatory and NASA.
Alternatively I can link stars and navigation like the student have seen in the Disney movie Moana. Or we can work on the different constellations across global cultures. Shared exploration like we do in the planetarium is what we aim for in higher education and the Planetarium supercharges that for my subject astronomy.
One of the NASA shows showing the ISS with its cosmic ray detectors.
This shared experience is teaching them collectively, a superpower for learning. When we learn together, we do it better and faster. If we do all our learning on individual screens, it remains an isolating experience.
If you want to enjoy the planetarium, you cannot have your screen out. It makes a difference.
Unfortunately, my class is the first and often only time students at UofL see inside this amazing space. The Louisville schools have not had the opportunity to organize school trips to the Planetarium because it closed and stayed closed since March 2020. And that is a shame but also a missed opportunity for UofL. These school trips brought those middle- and high school students to campus who might consider UofL for their immediate future.
This is a traditional slide, similar to the ones I use in class. And then we switch to the dome projection of the same data. It makes a huge difference!
The obstacle is two things, staff and equipment, but really that’s both a money issue. Staff got reassigned within UofL but we are at risk of not having people who know how to run a planetarium anymore. And the equipment is now well over 20 years old. It’s starting to show its age (“why is half the sky brighter than the other?”) The shows aged a bit too. We have a show where Liam Neeson confidently states there is no direct picture of a black hole. My science hasn’t sat still since that show came out: it made a picture of a black hole, found the first galaxies and more than 5000 planets around nearby stars. Just to give you an idea. More up-to-date material would be great.
The planetarium does two things that are increasingly rare in the modern world: a good look at the night’s sky and space and a shared learning experience for students.
The author with the Sloan Digital Sky Survey exhibit in the hall of the Planetarium. I got the SDSS plate but the staff turned it into the amazing exhibit.
End of the spring semester. I’ve been doing this long enough that I know it’s a stressful period. And even if I have everything perfectly planned or allow for flexibility, this is when I get the collective chaos full in the teeth. And when I lose the discipline with my stress mitigation strategies. These are:
Exercise — critical for stress reduction and to get rid of rumination. Improves sleep too.
Journaling. — stress and other localized stressors have been shown to lower when you write stuff down. I was pretty good about it till April and it went down the pipes.
Friday shutdown — a calendar point where I file all paperwork and clean up windows and blog. You’ll note it has disappeared.
Downtime — as in a day or even morning that isn’t structured to the hilt with tasks. Work has steadily eaten up more of the weekend. Contrary to my year goals.
Multiplication of tasks — this is varied but most asks are lowballed. Just a small thing in the mind of the request asker. And because I’m overwhelmed already, losing track of what needs to be done and is nice to have I say no to nothing. Unsustainable.
So yes. Lots of things I know I should do for mental health and lowered stress and yet these all fell by the wayside. I’m not going to lie: the myriad of chaos now reigning at the Federal level have had real repercussions for my students. Graduate admission and research opportunities for undergraduates have all almost evaporated with drastically lower odds for those from small schools. Uncertainty regarding science funding and the sudden and chaotic change of university president all did not really help for a feeling of stability. Or the fact that only now I can return to my office on campus. I hadn’t one this semester. Oops.
So I can use the summer. I am planning a routine and a rough schedule. It’ll be exciting: my very first graduate student is getting his PhD!
At the American Astronomical Society meeting in Washington DC last month (January was loooooong subjectively this year), I sat in a fascinating talk given by Karteyk Iyer. He and his collaborators developed a clustering map of the astrophysics literature. Quite literally the current landscape of the field.
The landscape of astronomical literature. You can go stand on a mountain of previous work or wade into the shallows of inter-disciplinary topics.
This maps out where lots (enough?) has been said already and where more could be done.
To show this in a little more scientific heat map:
The distribution of topics in astronomy as mapped onto a density map. It is in effect a giant clustering algorithm of vecorized papers.
What made me perk up about this was the option to ask a question or put in a phrase and get a list of papers that talk about that subject. This is partly LLM based and therefore can interpret plain language.
This hopefully circumvents the problem that certain issues had different nomenclature. For example “dark matter” (Vera Rubin’s and earlier Zwicky’s phrase) was talked about as “non-stellar mass-to-light ratio” by the radio astronomers. In effect the same thing. A sufficiently trained LLM can perhaps circumvent that.
On the one hand this makes me very excited. Putting in a phrase as part of my paper followed by a bunch of citations always elicited a worry that I was overlooking someone’s work unfairly. Simply because my memory of who did what is fallible at best and completely out to lunch at worst. I’m not alone in this, part of a referee’s job is to suggest more references that are relevant to the subject at hand. Better but still very fallible. I have tried some other tools (use both google scholar and ADS for example, connectedpapers was another).
And it has been shown that for example women are cited less in science (Nature: https://www.nature.com/articles/s41586-022-04966-w). I can imagine nothing more nefarious than poor human memory is to blame. I can also imagine other reasons.
So I was excited at the possibility of at least improving this issue of fair citations. One can put in the phrase that preceded the citations and see if more references pop up. Maybe to jog your memory.
This would be virtuous (give proper credit) but also make it easy to do (easy virtue….wait…).
The list often includes false positives I’ve found while playing around with it. It’s ranking of most relevant works certainly did not align with my personal one (that is also very subjective, which paper convinced you has something to do with which one you encountered first).
There is also no way to include feedback. And with many AI/ML applications, this is all dependent on the ingested training sample. A lot of science has been done before 1995 for example but may not be part of the ADS data-base. Has every journal been included? Some poorer academics only publish their results/catalogs on astro-ph because that is all they can afford (preprints not included right now), what was in a textbook etc etc.
But this shiny new AI tool may help me improve my citation practice. It might help yours as well.
