Gravity on the Horizon!

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joshua_tree_shoot_horizon_2Had to nip over to Joshua Tree National Park yesterday, for my sins.

Why? Well, gravity, of course. I can’t tell you the full details, but I was helping out the folks from the BBC on a documentary program (for the series Horizon, which I loved watching back in the 80s when I was in school!) being made about topics connected to gravity, space travel, mass, energy, and all that good stuff.

You can see me mid-demo in the photo (click for larger view), standing upon a Click to continue reading this post →

That Serial Film Crime…

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hobbit_poster_cropAfter all these years, I still have that little pain inside about what I think is one of the greatest missed opportunities (nay, crimes) in the history of film: that Guillermo del Toro did not get to direct the Hobbit due to all the delays in New Zealand over strikes (if I recall correctly), and so after two years of development he (and all his staff) packed up and moved on with their lives…. leaving Peter Jackson to take over the reins. That pain is right there next to those three jabbing pains inside that still feel a bit raw every time I get a reminder about how the films actually turned out overall. Just seeing a poster can set me off. (There are of course some nice set pieces in them here and there, but memory of them is rapidly erased by the overall wrong tone, silliness, and pandering to the need for pointless action sequences at the expense of common sense.) It’s old news now, but it still really hurts.

And it is nothing to do with the fact that Click to continue reading this post →

Back to Basics

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back_to_basicsHappy to say that I’m back to regular bread-making! The oven had some problems for a while and since I Was distracted by far too many things, I did not have time to get it fixed until recently. It is working again, and now I can make bread once more, and all is well with the world. Here is some of last week Sunday nights’s batch. (Seven other rolls were made, but those are bagged and frozen already…)

Hurrah!

-cvj

Screen Junkies – The Martian, Science, and Problem-Solving!

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screen_junkies_martianAs promised, the Screen Junkies episode we made is out. It is about The Martian! JPL’s Christina Heinlein (a planetary science expert) also took part, and I hope you find it interesting and thought-provoking. Maybe even funny too! As usual, there’s a lot that was said that was inevitably left on the (virtual) cutting-room floor, but a lot of good stuff made the cut. All in all, I’d say that this film (which I enjoyed a lot!) had a refreshing take on science and engineering for a big studio film, on several scores. (Remaining sentences are spoiler-free.) First, rather than hiding the slow machinations involved in problem-solving, it has a lot of it up front! It’s an actual celebration of problem-solving, part of the heart and soul of science and engineering. Second, rather than have the standard nerd stereotype Click to continue reading this post →

Get ready for some “movie science” chatter…

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hal_cvj_christina_bigYes, I’ve been hanging out with my Screen Junkies friends again, and this time I also got to meet JPL’s Christina Heinlein, who you may recall was in the first of the Screen Junkies “Movie Science” episodes last year. While we were both in it, I’d not got to meet her that time since our chats with host Hal Rudnick were recorded at quite different times. This time, however, schedules meant Click to continue reading this post →

Metals are Shiny

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metals_are_shiny

“Metals are shiny.” That’s one of my favourite punchlines to end a class on electromagnetism with, and that’s what I did today. I just love bringing up a bit of everyday physics as a striking consequence of two hours worth of development on the board, and this is a good one for that. I hope the class enjoyed it as much as I did! (Basically, as you can’t see in the snapshot of my notes in the photo, those expressions are results of a computation of the Click to continue reading this post →

Thomas and Fermi

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thomas-fermiThe other day the Thomas-Fermi model (and its enhancements by Dirac and others) wandered across my desk (and one of my virtual blackboards as you can see in the picture) for a while. Putting aside why it showed up (perhaps I will say later on, but I cannot now), it was fun to delve for a while into some of these early attempts in quantum mechanics to try to understand approximation methods for treating fairly complicated quantum systems (like atoms of various sizes). The basic model showed up in 1927, just a year after Schrodinger’s Click to continue reading this post →

Moon Line

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lunar_eclipse_line
(Click for larger view.) This was a heartening reminder that people still care about what’s going on in the sky far above. This is a snap I took of a very long line of people (along the block and then around the corner and then some more) waiting for the shuttle bus to the Griffith Observatory to take part in the moon viewing activities up there tonight. (I took it at about 6:00pm, so I hope they all made it up in time!) The full moon is at close approach, and there was a total lunar eclipse as well. Knowing the people at the Observatory, I imagine they had arranged for lots of telescopes to be out on the lawn in front of the Observatory itself, as well as plenty of people on hand to explain things to curious visitors.

I hope you got to see some of the eclipse! (It is just coming off peak now as I type…)

-cvj

Rearrangements

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office_musings_2 Just thought I’d share with you a snapshot (click for larger view) of my thinking process concerning my office move. I’ve been in the same tiny box of an office for 12 years, and quite happy too. For various reasons (mostly to do with one large window with lots of light), over the years I’ve turned down offers to move to nicer digs… but recently I’ve decided to make a change (giving up some of the light) and so after much to-ing and fro-ing, it seems that we’ve settled on where I’m going to go.

Part of the process involved me walking over there (it’s an old lab space from several decades ago, hence the sink, which I want to stay) with a tape measure one day and making some notes in my notebook about the basic dimensions of some of the key things, including some of the existing Click to continue reading this post →

Face the Morning…

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expo_line_lady_11_sept_15With the new semester and a return to the routine of campus life comes taking the subway train regularly in the morning again, which I’m pleased to return to. It means odd characters, snippets of all sort of conversations, and – if I get a seat and a good look – the opportunity to practice a bit of quick sketching of faces. I’m slow and rusty from no recent regular practice, so I imagine that it was mostly luck that helped me get a reasonable likeness Click to continue reading this post →

MacArthur’s Balls

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macarthur_balls_cvjYou should go and see them! (Click image for larger view.) Nobody seems to be talking much about this – or I’m utterly out of touch these days since I’ve not seen a thing about this and nobody I asked seems to know either – but there’s a wonderful thing to see down at MacArthur Park. (No, it is most definitely not a cake left out in the rain, since… you know… no rain.) There are about 2500 spheres floating in the lake, and looking quite splendid, I might add. I love this highly neglected park, and so am glad that someone feels the same way and got (I read after gingerly googling “balls macarthur park” and finding this article) about 10,000 volunteers to help paint and launch these balls in an art project aimed at bringing the park back into people’s minds, at least for a while.

The panorama (click for larger view) does not do it justice, since it flattens and shrinks, by necessity, so I recommend going along and getting up close and having a look (as I ought to have done, but was on my way home in a rush and Click to continue reading this post →

Naked!

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negative_mass_thoughtsSnapshot of my doodles done while talking on the phone to a BBC producer about perhaps appearing in a film discussing anti-gravity*. I explained lots of things, including why General Relativity does not seem to like negative mass, partly because they have something called a “naked singularity”, which is a big problem. Only after the call ended did I recall that in 1999 I co-authored a paper in which we discovered a new mechanism for removing such singularities in some cases, using D-branes in string theory. That’ll be a fun thing to try to explain to camera in simple terms. Hmmm….

-cvj

*Some blurring of rest of page to remove some not-for-public stuff.

PBS Shoot Fun

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pbs_shoot_selfieMore adventures in communicating the awesomeness of physics! Yesterday I spent a gruelling seven hours in the sun talking about the development of various ideas in physics over the centuries for a new show (to air next year) on PBS. Interestingly, we did all of this at a spot that, in less dry times, would have been underwater. It was up at lake Piru, which, due to the drought, is far below capacity. You can see this by going to google maps, looking at the representation of its shape on the map, and then clicking the satellite picture overlay to see the much changed (and reduced) shape in recent times.

There’s an impressive dam at one end of the lake/reservoir, and I will admit that I did not resist the temptation to pull over, look at a nice view of it from the road on the way home, and say out loud “daaayuum”. An offering to the god Pun, you see.

pbs_shoot_piru

Turns out that there’s a wide range of wildlife, large and small, trudging around on the Click to continue reading this post →