johnm1019

The dose limits for radiation workers (which includes airline flight crews) is 20 mSv/yr. This is supported by the ICRP [1] and the EU [3].

British Airways carried out and published data from radiation monitoring of Concorde crews: "Supersonic transport (SST) flights The Concorde SST... was designed to fly at the... operating altitude of around 18 km (about 59 000 ft). Concern for potential hazards... led to monitoring equipment... being installed in all Concorde aircraft. Many data have been derived from this, including more than 20 years experience of the radiological environment. ...these flights indicate that the radiation exposure of Concorde flying crew is unlikely to exceed 6 mSv/y." [2]

I will also suggest the interested reader look into "radiation hormesis" and what data really exists to support the linear-no-threshold (LNT) model, or the idea that any amount of radiation raises risk, below certain dose rates. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2889502/

[1] http://www.icrp.org/icrpaedia/limits.asp [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1128520/pdf/oen... [3] http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=OJ:L:...

I don't see anywhere in the article what they estimate or have tested the full system efficiency to be.

Why do men and women need to be the same? Isn't it ok to be different?

A chainmail suit will direct the energy around you. They make more pedestrian looking versions of these which folks who work with high voltage often wear as protection

Largely, the healthcare sector has captured that money. Wages are flat but benefits are up.

Will this affect only US govt bonds or corporate bonds too?

Something doesn't add up then, the listed elevation for SFO is 13.1 ft MSL. http://www.airnav.com/airport/KSFO

UPDATE: tolerances around GL are 20 ft https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=&SID=&r=PART&n=...

The Slack client is a mind boggling exercise in excess. It often requires 500MB+ RAM when I am connected to two different Slack "networks" and it's an IRC client!? Honestly with so much money and theoretical engineering talent what went wrong here?

If you really want to save money on household type items, go shopping in the 'market' area at your local IKEA store. Compare that with Amazon prices for pretty much everything and you'll be blown away by how cheap IKEA is.

The value created by access to a car they can afford will advance both India and the world to the next level of health, abundance, and technology. Just as the car and the ICE advanced so many other places of the world from the horse cart. With that I believe will come the education and technology needed to push us past ICEs and further into the future.

FTA "Additionally, the Lee-Gardner Amendment would require the FAA to eliminate the Mach 1 speed limit over the United States and replace it with a well tailored sonic boom standard."

They mention at the end of the article they are working on larger scale water processing systems which would recover and reuse the particles. I think this is critical not only for efficiency but also health and safety. I'd rather not end up drinking unknown nanoparticles... I hope the musings in the article that it might also work for lead removal turn out true. Good luck!

I've found for better "real-world" testing, once my app is passing the basic emulators, the Firebase real-device test cloud is excellent for reliable data on what will happen on User XYZ's actual device.

https://firebase.google.com/docs/test-lab/

A great example is Ally Bank (happy customer here!)

https://www.ally.com/bank/interest-checking-account/#fees

My personal opinion is a two part solution

1. Ensure private establishments can establish restrictions on all forms of smoking. Then they could establish designated 'smokers corners' far away from entrances and ventilation equipment (as often seen now around hospitals which ban smoking).

2. Handle the person-next-to-you situation the same as I would now with anyone whose behavior or presence was disturbing my experience. I would inform the staff of the situation and that it's ruining my experience and ask them to handle it. If they decline, ask for a refund and leave. Don't go back to that theatre -- vote with your money!

This suggests engines are 50% more efficient today than in 1960, with 80% reductions in fuel per passenger seat. [1]

If advanced physical simulations could produce a wing 20% more efficient than the concorde, with engines 20% more efficient, and the weight of control, actuation systems, and cabin interiors were all reduced by 20% the gains in operating cost and range would be substantially more than 20%. Gains in aircraft are typically non-linear because they all affect each other.

It's exciting to think about what might be possible with 50 years of materials science, _computers_, simulation, electronics, and propulsion technology.

[1] http://www.atag.org/component/downloads/downloads/59.html [pdf]

There are old, large, non-tech companies that do this as well https://corporate.ford.com/content/dam/corporate/en/investor...

I imagine there are two factors at play here:

1. Since digging takes time, you really only need the permits where you are actually digging. So if you start on a piece of land you largely control, or can quickly get permits for, you could theoretically bore until where you need the next permit.

2. For all these permits, you would apply for them in parallel, so you don't really need 100% of the permits for the entire length of the tunnel to start.

I always found the Delta arrangement very interesting. The refinery took a $10 million loss which saved DL $100 million. [1] But it also saved rivals money. When they make cheaper jet fuel it doesn't just go to Delta. They have to sell the fuel into the Jet-A for the region. That means they subsidize all the other airlines too.

So DL says, if we give each airline $90 million (# made up), our use and deployment of capital will be (is?) more efficient and therefore it's a net win for us.

Or possibly in another thought-experiment, it's better that each airline has the money to invest in their businesses and products, such that the entire Aviation industry benefits, rather than giving that profit to an O&G company.

[1] http://finance.yahoo.com/news/exclusive-deltas-refinery-sacr...

I'm thinking the connector end is designed to conductively couple to the dock, possible also through the second connector.

Hah yes we did. Wires. Of course everyone wants wireless though and while it would've improved the overall experience I'm not sure it would've saved the company. Other market factors were making more of a problem than just delivering good tech :/

In further thinking about the idea, once the wifi devices are time synced like this, you can also begin to use that signal for localization in addition to the traditional optical or electromagnetic tracking. Fun!

This is huge news to me. Standardized microsecond level wireless time sync available on cheap commodity hardware. We could've used this at the startup I was at 4 years ago. I see lots of uses in the AR space, along with device tracking algorithms.

TLDR; There was a single train emitting both correct and erroneous signals. This caused trains in the vicinity to lose data link which triggered an emergency brake safety feature. The article doesn't make clear what medium the trains communicate on which was affected (e.g. rail, wireless, powerline). They have not yet determined what caused the faulty hardware (or software???) on the faulty train to enter this state.

Try Google Docs while working with 3 people at the same time. It will blow your mind.

While I agree the tone of the article is a paid ad, the reason you can't compare it to a model 3 is because the model 3 doesn't exist yet. Comparing it to a Model S is ok in the sense that you _can_ compare a Cessna 172 to a Learjet, but why? Different markets, different price points.

I have to wonder if part of the trend is that a generation of software developers came out of college and jumped into the startup scene during its most recent run. These folks are now forming relationships and starting families, or wanting to spend more time doing not-software dev things. They are realizing that stability in your job lets you do and plan other things in your life. Given that there is no economic certainty in working for a small start up in a city with an astronomical COL, many are deciding the risk isn't worth the rewards.

It's also possible that there are really large challenges being undertaken which require resources that actual start-ups with 10 million in VC can't do. Things like autonomous cars (Uber isn't a start-up anymore IMO), rocketry, aerospace, energy, foundational biology. Is it possible that many great minds see these as more worthwhile pursuits?

I would say Chevy is years ahead because not only are the Bolts they are building today going on sale before the end of the year[0], they have years of experience and billions in assets designed to help them build cars. Tesla says the model 3 goes on sale "late 2017". By then we'll have the 2018 MY Chevy Bolt, which could be just as good or better? Or cheaper?

[0] http://finance.yahoo.com/news/gm-starts-producing-200-mile-2...

You can buy all kinds of other beers in Germany. There are craftbeer stores that carry all kinds of imports from awesome Belgium beers to Cali IPAs and everything else. I'm not sure legally if it's sold as some sort of other alcohol, but you can get it w/o issue.

I love walking and would do it more often, but how have you kept up the health of your knees? If I walk (like walking from A > B in one go) more than about 2 hours a day by the 3rd or 4th day my knees start to feel it.

> Do you hire and pay the 60th percentile at approx. local market rates? Do you hire the best remote people at SFBay market rates?

The business owner in me says start low and raise your rates until you get the talent you're happy with. I would offer uniform base pay as typically lower costs of living come with other tradeoffs. If someone wants to make that work let them (but make it clear that it's their responsibility to make sure the electricity and internet are flowing when it's time to get to work)

> How is payroll and benefits handled?

I would suggest doing it like the oil companies, you setup a company and banking in the caribbean somewhere, and then pay folks salary into bank accounts there for them as well. Make it their problem to move/repatriate money. Don't withhold any taxes and factor in a fixed rate for any bennies you want to offer (unless legally prohibited in specific jurisdictions of course, IANAL). Let them optimize the money. I know this is how big oil companies pay most of their workers who are on rigs in various locales in the world (and not just offshore!).