On a visit to the London Science Museum, my oldest grandson explained to me how 3D printing works. I expressed doubt about its economic value, but he pointed out this sign. ”Aha,” I said, “here is a clear-cut case of a technological change that should reduce long-run average cost (by saving on materials).”
And despite the last sentence of the picture, this saving will eventually be passed onto consumers in the form of lower ticket prices, but probably not fully in the oligopolistic aircraft manufacturing industry.
Due to popular demand, we are working on a podcast about Bitcoin. Last night, I interviewed Marc Andreessen on the subject. His v.c. firm has invested roughly $50 million in Bitcoin-related companies, including CoinBase, and they are looking for more. It was a fascinating interview, in part because Andreessen has been personally involved in so many major digital events of the past 20 years.
In light of today’s news about the meltdown of Mt. Gox, the most prominent Bitcoin exchange to date, here is a preview of a section of last night’s interview with Andreessen. His view is vigorously contra the notion that the end of Mt. Gox would mean the end of Bitcoin; in fact, he would take that as a sign of progress: Read More »
Our podcast called “Where Have All the Hitchhikers Gone?” got a listener named Jenny O’Brien thinking. Here’s what she wrote us:
Here’s the back story: I live in a rural area in Northeast Kansas, where there is no bus, so I am forced to drive all the time. After I heard your podcast, I started thinking about how to make hitchhiking safe, easy and reliable so I and other rural residents can use it as a public transportation option. I figured that all the hitchhiker really needed was a credential, way to signal her destination, and a system to record who she is riding with for safety.
Our latest podcast is called “Who Runs the Internet?” (You can subscribe to the podcast at iTunes, get the RSS feed, or listen via the media player above. You can also read the transcript; it includes credits for the music you’ll hear in the episode.)
It begins with Stephen Dubner and Steve Levitt talking about whether virtual mayhem — from online ranting to videogame violence — may help reduce mayhem in the real world. There is no solid data on this, Levitt says, but he hypothesizes:
LEVITT: Maybe the biggest effect of all of having these violent video games is that they’re super fun for people to play, especially adolescent boys, maybe even adolescent boys who are prone to real violence. And so if you can make video games fun enough, then kids will stop doing everything else. They’ll stop watching TV, they’ll stop doing homework, and they’ll stop going out and creating mayhem on the street.
This episode then moves on to a bigger question about the Internet itself: who runs it? As Dubner asks: “Who’s in charge of the gazillions of conversations and transactions and character assassinations that happen online every day?” Read More »
We’ve blogged before about the potential of 3D food printers, but at the moment such printers seem out of reach for the average consumer. Perhaps not for long — a new paper by B.T. Wittbrodt, A.G. Glover, J. Laureto, G.C. Anzalone, D. Oppliger, J.L. Irwin, and J.M. Pearce conducts a cost-benefit analysis of 3D printers for the average household:
This study reports on the life-cycle economic analysis (LCEA) of RepRap technology for an average U.S. household. A new low-cost RepRap is described and the costs of materials and time to construct it are quantified. The economic costs of a selection of twenty open-source printable designs (representing less than 0.04% of those available), are typical of products that a household might purchase, are quantified for print time, energy, and filament consumption and compared to low and high Internet market prices for similar products without shipping costs. The results show that even making the extremely conservative assumption that the household would only use the printer to make the selected twenty products a year the avoided purchase cost savings would range from about $300 to $2,000/year. Assuming the 25 hours of necessary printing for the selected products is evenly distributed throughout the year these savings provide a simple payback time for the RepRap in 4 months to 2 years and provide an ROI between>200% and >40%. As both upgrades and the components that are most likely to wear out in the RepRap can be printed and thus the lifetime of the distributing manufacturing can be substantially increased the unavoidable conclusion from this study is that the RepRap is an economically attractive investment for the average U.S. household already. It appears clear that as RepRaps improve in reliability, continue to decline in cost and both the number and assumed utility of open-source designs continues growing exponentially, open-source 3-D printers will become a mass-market mechatronic device.
(HT: Marginal Revolution)
The standard narrative around technology in the developing world usually focuses on the positive: cell phones make it easier to check crop prices, transfer money, and understand violence. But a new study, summarized in Foreign Policy, finds that all this connectivity can also increase political violence in violence-prone regions and countries:
A new study by Jan Pierskalla of the German Institute of Global and Area Studies and Florian Hollenbach of Duke University looks at the relationship between mobile phones and political violence in Africa. They found that from 2007 to 2009, areas with 2G network coverage were 50 percent more likely to have experienced incidents of armed conflict than those without. The clearest overlaps between cell coverage and violence were observed in Algeria, the Democratic Republic of the Congo, Kenya, Nigeria, Uganda, and Zimbabwe.
The authors think that improved cell-phone coverage helps insurgent leaders overcome what’s called the “collective-action problem” — that people are reluctant to join group endeavors when there’s a high level of personal risk. But better communication helps leaders recruit reluctant followers, whether they’re demonstrating for higher wages or killing people in the next town.
In our podcast “Waiter, There’s a Physicist in My Soup!,” we talked to Pablos Holman at Intellectual Ventures about food printers (we’ve also blogged about organ printers and meat printers). Now NASA is funding an Austin, Tex., company that is working on a pizza printer. From CNET:
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Systems and Materials Research recently received a $125,000 grant from NASA to make a pizza. OK, it’s a little more complicated than that. Contractor already created a proof-of-concept printer that can print chocolate onto a cookie. His next goal is to print out dough and cook it while printing out sauce and toppings.
E-mail has been around long enough for most of us to fall in love and hate and love with it at least a few times. Problems arise and are quashed, or dealt with. Innovations come along; customs evolve. But one grisly bad habit won’t go away: the “reply-all” dilemma. You know what I’m talking about. Someone sends you a group e-mail. Maybe it’s your company’s marketing boss, or the head of your bowling league, or the parent-teacher liaison in your kid’s school. And even if that e-mail was meant to be simply explanatory, or to garner responses only to the sender, inevitably a few of the people on the receiving end simply hit “reply all” and suddenly your in-box starts to fill up with a chattering storm of crap. Sure, you could mark all those senders as spam but then you might miss something important later. Sure, you could politely tell people not to use “reply-all” when it’s unnecessary but plainly they don’t think it’s unnecessary, and you’ll come off sounding like a jerk. Sure, you could just deal with it and chalk it up to a downside of a great invention. But does anyone have any better ideas?