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+ - Global map of Ganymede published by USGS

Submitted by Grampa John
Grampa John (1817948) writes "A group of scientists has produced the first global geologic map of Ganymede, Jupiter’s seventh moon. The map, published by the U. S. Geological Survey, illustrates the varied geologic character of Ganymede’s surface, and is the first complete global geologic map of an icy, outer-planet moon. The geologic map of Ganymede is available for download online."

Comment: Re:They can get someone younger for much less pay. (Score 1) 629

by Grampa John (#45539511) Attached to: Ask Slashdot: Are We Older Experts Being Retired Too Early?
True, but one key is to differentiate yourself from the young-uns. I am over 65 and "officially" retired, but I can get as much business as I want. My philosophy is that if someone wants me to write code, my rate is not high enough. Instead, I offer myself as a mentor, or for technical due-diligence, or to help evaluate tech adoptions or architectural choices, or as an expert witness. I am still a productive programmer, but all my programming is now volunteer, open-source work, just for fun. When someone is paying me, I expect leverage. My personal productivity is much higher in mentoring and leadership roles. YMMV, of course.

Comment: Re:Screening your calls (Score 5, Informative) 497

We had a similar problem a few years ago. Although it was not a debt-collection scam, some sort of bot was calling many times/day and all through the night. Really annoying. So we talked to our provider (the local cable company) and they set up an interception service that forces callers to affirm that the call is legitimate by hitting a couple of numbers before the call comes through to us. We have not had a robocall since then. We can whitelist numbers so they don't get challenged, but have not done much of that. We pay perhaps a dollar/month for the service.

Comment: Re:A cobbler should stick to his last (Score 2) 776

IAAESS also. There is clearly enough wind and solar energy available in the U.S. to meet our needs. It could be scaled up to completely replace coal-burning in much shorter time than it would take to build a new generation of nuclear plants, and with much less public subsidy. But that's not the real problem with nuclear. The bigger problem is that baseload resources are basically incompatible with renewable resources like wind and solar, because they cannot respond quickly enough to "fill in the gaps" when the wind stops blowing or the sun goes down. A large nuclear plant can take three days to start up, and a coal plant can take 8 hours or more. If you want really expensive electric power, build a new nuclear plant or a large coal plant in a place that already has high penetration of renewables, like Denmark or Germany or Spain, or even California. If you are lucky, you can run it about 10% of the time, so the cost has to be recovered with a fraction of the design output. For a nice description of what's happening to baseload plants in Europe, see a recent article in the Economist: There's a much cheaper way and less risky way to go if cutting CO2 is the goal: renewables plus storage and demand response. It's happening in California already.

Comment: Re:Go for it (Score 5, Insightful) 314

by Grampa John (#43679957) Attached to: Ask Slashdot: Becoming a Programmer At 40?
I made the transition at about age 40, 25 years ago, and it was an excellent career move. But I also spent some time taking CSci courses as a part-time student. There are important issues you should understand that are not in any programming-language handbook or website. These include the problems of concurrency (race conditions, deadlocks), complexity of algorithms, and the basic data structures. Good luck to you!

Comment: Re:Consulting (Score 1) 306

by Grampa John (#41927905) Attached to: Ask Slashdot: Finding Work Over 60?
I am 65 and trying to retire, but I have one client now plus my previous employer wanting me to help out. I could probably get as much consulting work as I want, at a rate significantly higher than I could get when I was 50. I doubt anyone would hire me for full-time work, but I don't really want that. And I'm not programming for hire - I do that for fun. I expect more leverage than that. I figure if someone wants me to write code, I'm not charging enough. You need to find ways to sell your experience.

Comment: Re:We could make it work (Score 1) 452

by Grampa John (#39822125) Attached to: Organics Can't Match Conventional Farm Yields
We could easily gain back much more than the "lost" 34% by cutting our meat consumption. If you are really concerned about your personal impact on the planet, you can do more by cutting out the meat - all of it - than by buying cfl bulbs or a high-mileage car or whatever. There's a nice little book published back in the early 70s called "Diet for a Small Planet". It's more relevant now than it was back then.

Comment: Re:Rule #1 (Score 1) 480

by Grampa John (#39408785) Attached to: Ask Slashdot: What Are Your Tips For Working From Home?
I waited until my kids were grown up and out of the house. But seriously, the biggest problem I often have is knowing when to quit for the day and when to take a day off. You can easily get into a 7X12 or more work situation if you are not careful. If the weather is good, I try to get outdoors for an hour or so every day. If it's really good, it may be four hours, which I then have to make up in the evening.

Comment: I have never seen this (Score 1) 107

by Grampa John (#38927947) Attached to: Researchers Feel Pressure To Cite Superfluous Papers
I am an author and an editor of a journal that could use a higher impact factor to get noticed. But I have never been "encouraged" to add a reference that was not clearly missing (there have been one or two of those, due to inadequate research on my part), and as an editor I have never asked for additional references except in cases where there was clearly prior work that the authors should have been aware of and should have cited, usually because the missing references actually showed the results the authors were claiming as new contributions. So I think this is a case of extreme self-selection, and perhaps a particular field or journal where some practices need to be examined. I just don't see it in Computer Science, Economics, or related fields where I read and publish.

Comment: You should own it (Score 1) 211

by Grampa John (#37498642) Attached to: Ask Slashdot: Best Copyright Terms For a Thesis?
At Minnesota, where I teach, and where I did my Masters and Ph.D. theses, students and faculty own copyright to their original work, including scholarly work (papers, theses, etc.) and original course materials. See for details. My understanding is that this arrangement is extremely common in the U.S. I am a strong advocate of open source and creative commons, but in this case I would encourage you to simply copyright your thesis. That does not mean others cannot use it, it just means that they must attribute the work to you, and cannot claim it as their own.

Comment: Re:Absolutely (Score 3, Informative) 398

by Grampa John (#32318512) Attached to: Scientific R&D At Home?
Yes, indeed, there is a huge untapped frontier in software, both for making discoveries (programs that find and fix their own bugs, for example), and for doing interesting research in other areas. One place to look is computational economics - building complex market scenarios and figuring out how they work. As far as I know, nobody did that before the big mess in California's energy market in 2000. See the Trading Agent Competition or Leigh Tesfatsion's summary of Agent-Based Computational Economics.

Debug is human, de-fix divine.