Author Archives: rdmyers75@hotmail.com

apps for splitting bills

This Learnvest article mentions a few apps for splitting bills that I hadn’t heard of.

  • Splitwise: If your group is taking turns covering expenses (“you get this dinner; I’ll get the next”), track them with Splitwise. This app keeps a running total of who’s covered what, so you can settle the difference at the end via Venmo or PayPal.
  • Billr: Perfect for large parties, this app lets you split a bill with up to 16 people so each person pays for what they ordered, plus their portion of any shared items, tax and tip. You can also send each person a copy of the split bill in a text or email.
  • Divvy: Snap a photo of your bill and drag each item to the appropriate person (uploaded through your contacts) and Divvy will automatically add up what each person owes, plus tax and tip.

A Deepness in the Sky

I just finished A Deepness in the Sky by Vernor Vinge, and it was the most enjoyable book I have read in the last couple years. I’m not going to spoil the plot, but like all Vernor Vinge books it has layers upon layers with themes such as civilizations rising and falling, technological progress (and sometimes regression) with its opportunities and dangers, interactions between civilizations at different levels of technology, and at similar levels of technology but with different cultures and values. The plot unfolds over long periods of time while the characters are very real, accessible, and human, even if not all of them are actually human.

record U.S. weather disasters in 2017

Major hurricanes, fires and floods set a new record for the cost of damage in the U.S. in 2017. Setting aside the human misery caused, natural disasters tend to provide a short-term economic stimulus, because it is rare time that politicians tend to set aside their differences and borrow or print money as necessary to solve the problem. In the longer term though, I can’t help thinking that this is one way climate change can make us poorer, because we will be spending money and effort dealing with a higher rate of disasters that we could otherwise be spending on more productive work, investment or innovation. The other way climate change can make us poorer is just the long, slow grind of rising energy, food and water prices. I can imagine these two trends working together, where we are adapting to that long, slow grind, but when the disasters hit we no longer have the ability to recover completely like we used to. This is not unlike a stressed ecosystem that manages to hang on until that fire or flood hits, but then does not have the soil conditions or the seed bank or whatever to rejuvenate itself in the same spot after it gets wiped out.

household-scale biogas

It makes a lot of sense to combine sewage, yard waste and food waste in an anaerobic reactor to produce methane, which can be used for heat, to fuel vehicles, to generate electricity, or even to power fuel cells. This is done sometimes at a city or utility scale, but people haven’t really tried to do it in their basements. This article is about an attempt to do that in Yemen.

freshwater salinization syndrome

The National Academy of Sciences has a new study out on “freshwater salinization syndrome“. If I understand it correctly, it goes something like this: Air pollution and acid rain leach minerals like calcium out of all the concrete we use for pavement and buildings. All the road salt we apply leaches minerals like calcium out of soil and replaces it with sodium. The result is a lot more minerals like calcium in freshwater, which changes its alkalinity, or in high school science terms, its pH and ability to resist changes in pH.

Salt pollution and human-accelerated weathering are shifting the chemical composition of major ions in fresh water and increasing salinization and alkalinization across North America. We propose a concept, the freshwater salinization syndrome, which links salinization and alkalinization processes. This syndrome manifests as concurrent trends in specific conductance, pH, alkalinity, and base cations. Although individual trends can vary in strength, changes in salinization and alkalinization have affected 37% and 90%, respectively, of the drainage area of the contiguous United States over the past century. Across 232 United States Geological Survey (USGS) monitoring sites, 66% of stream and river sites showed a statistical increase in pH, which often began decades before acid rain regulations. The syndrome is most prominent in the densely populated eastern and midwestern United States, where salinity and alkalinity have increased most rapidly. The syndrome is caused by salt pollution (e.g., road deicers, irrigation runoff, sewage, potash), accelerated weathering and soil cation exchange, mining and resource extraction, and the presence of easily weathered minerals used in agriculture (lime) and urbanization (concrete). Increasing salts with strong bases and carbonates elevate acid neutralizing capacity and pH, and increasing sodium from salt pollution eventually displaces base cations on soil exchange sites, which further increases pH and alkalinization. Symptoms of the syndrome can include: infrastructure corrosion, contaminant mobilization, and variations in coastal ocean acidification caused by increasingly alkaline river inputs. Unless regulated and managed, the freshwater salinization syndrome can have significant impacts on ecosystem services such as safe drinking water, contaminant retention, and biodiversity.

It’s a little ironic that this is happening to fresh water at the same time we are worried about ocean acidification. There is also a larger context to me though – even if our waters meet numerical standards we set for water quality, they just don’t have the same chemistry, biology, or links to the land that they used to. This would still happen even if we were able to eliminate all pollution that is directly toxic to aquatic life.

reading and the brain

There is a fair amount of evidence that reading is good for the brain. One of the reasons is that reading narratives and having to get into the characters’ heads helps to build empathy in real life.

Improved theory of mind comes primarily from reading narratives, research suggests. One meta-analysis published by Raymond A. Mar of Toronto’s York University reviews many of the studies demonstrating the effect of story comprehension on theory of mind, and concludes that the better we understand the events in a narrative, the better we are able to understand the actions and intentions of those around us. The kinds of narratives we read, moreover, might also make a difference. One study, conducted by psychologists David Comer Kidd and Emanuele Castano of the New School for Social Research, tested the effect of differences in writing quality on empathy responses, randomly assigning 1,000 participants excerpts from both popular bestsellers and literary fiction.

The type of writing appears to matter, with more literary fiction helping more than best-sellers or non-fiction. A piece of good news is that audiobooks seem to be fine. The article doesn’t get into electronic vs. paper forms of reading, or reading vs. television or video games. It does quote one neuroscientist who questions whether reading is really special compared to other forms of experience.

One hypothesis I have, based on my own experience with people who can’t read in two different corners of the world, is that reading could change the nature of a person’s verbal skills, and not necessarily for the better. People who can’t read sometimes have the “gift of gab”, are good storytellers, and are good at teaching children to speak their native language. And similar to teaching small children, they can be incredibly patient with illiterate foreigners like myself, where an educated person would not have the patience, or somehow, maybe not have the empathy, to do that. So while I think reading and writing and certainly very important to our species, they also may have changed us along the way.

experimental quad-copter at Boeing

Boeing has an experimental quad-copter that can lift 500 pounds. The way they describe it, this could fill a niche between shipping of huge containers and delivery of tiny parcels to your door.

This kind of vehicle may not fit into your drone delivery fantasy, but it has practicality on its side. “This starts to sound like the kind of thing that can do things in real life,” says Drew McElroy, CEO of Transfix, a trucking brokerage firm. As home deliveries have grown in popularity over the past 15 years or so, he says, shipments have gotten smaller, and more targeted. The old model—trucks haul supplies to Walmart, people drive to Walmart and bring home their shopping—is evaporating. Any vehicle that can fill in the gaps between the huge bulk shipments that move by sea and the shoebox-sized packages that come to our doors can play a role.

The other interesting thing about the article is a brief description of the R&D unit that developed this thing.

In fact, Boeing isn’t quite sure where it’s going. “It’s a concurrent exploration of a nascent market and nascent technology,” says Pete Kunz, the chief technologist for HorizonX, the Boeing skunk works-venture capital arm hybrid division ///something like that/// that built this thing (the marketing team hasn’t given it a catchy moniker yet)…

Exactly what it will carry and where it will take it remains an open question. Boeing doesn’t have any concrete plans or timelines for commercialization yet, but Logan Jones, HorizonX’s senior director, says it could tote supplies to offshore oil rigs, or any other “dull, dirty, and dangerous” work now done by helicopters, which require expensive human pilots. It could take pallets from a port to a distribution center, or from a distribution center to a store. “This won’t show up at your door,” Jones says. (This is a commercial project, but it’s easy to see potential military applications, like moving supplies around combat areas.)

 

 

the unraveling of complex systems

This account of 96 terrible hours at JFK airport caused by terrible, but not unusually terrible, winter weather reminds us how unresilient our modern infrastructure systems can be, and how unresilient our under-maintained and investment-starved U.S. infrastructure is in particular.

By Sunday, after half a foot of snow, gale force winds, and three days of single-digit temperatures, JFK had set a new standard for air travel horrors: Travelers waited for hours or days for their flights, sitting on scavenged sheets of cardboard in their socks, fuming to nearby reporters and farflung Twitter followers. Outside, the scene was more apocalyptic. Aircraft crowded the tarmac, too many of them for the gates. Passengers were left in planes for as long as seven hours after landing. And that was a full day and a half after the cyclone bomb had dissipated.