samcheng

60 ms·

511.
by samcheng 10y ago
Two reasons why the current Uber/Lyft situation causes more traffic than the old taxi situation: 1) The bar for driving a car in the city for pay has been lowered significantly from the old taxi medallion system. This makes for a much
512.
by samcheng 10y ago
Any support for "rolling" partitions? e.g. A partition for data updated less than a day ago, another for data from 2-7 days ago, etc. I miss this from Oracle; it allows nice index optimizations as the query patterns are different
513.
by samcheng 10y ago
If you can't charge overnight, you really shouldn't have an electric vehicle. You end up MORE inconvenienced than a gasoline/diesel driver, instead of LESS inconvenienced. Apartment landlords are coming around, quickly, thou
514.
by samcheng 10y ago
Contraceptives as a Service already exists! https://www.buzzfeed.com/stephaniemlee/these-apps-deliver-bi...
515.
by samcheng 10y ago
As far as low-tech tic-tac-toe "AIs" go, this XKCD map is my favorite: https://xkcd.com/832/
516.
by samcheng 10y ago
RINSE | San Francisco, CA, Culver City, CA, Bozeman, MT, and Washington, DC | Full Time Rinse is a technology-enabled dry cleaning and laundry delivery service. We've grown at double-digit month-over-month rates for over three years no
517.
by samcheng 10y ago
Right, but the question was about the batteries, which hang on the wall in the garage. Nobody has the expectation that such an appliance will last the lifetime of the house. Solar panels also degrade, roughly 1% per year, and commonly have
518.
by samcheng 10y ago
Tesla automotive batteries have shown pretty strong resilience over the few years they have been running, even on cars that have been driven hard. Cars are at >90% capacity after 50,000 miles. It's not like the batteries need to be
519.
by samcheng 10y ago
RINSE | San Francisco, CA, Culver City, CA, and Washington, DC | Full Time Rinse is a technology-enabled dry cleaning and laundry delivery service. We've grown at double-digit month-over-month rates for over three years now, our busine
520.
by samcheng 10y ago
Well, if any tank failure would cause an explosion, wouldn't the hypothetical sniper aim at a big tank? Not a tiny flask located inside another tank.
521.
by samcheng 10y ago
If the failure has been isolated to the helium tank, that further debunks the 'sniper' hypothesis, right?
522.
by samcheng 10y ago
Note that the second-stage helium system was also the source of the previous explosion of a SpaceX mission to the International Space Station (which blew up during launch). https://en.wikipedia.org/wiki/SpaceX_CRS-7#Lau
523.
by samcheng 10y ago
How big is the upper-stage cryogenic helium tank? I imagine not very large, and it's not obvious to me exactly where it is placed. The hypothesized saboteur would have to be an amazing shot!
524.
by samcheng 10y ago
Here's the payout: > This installation was completed in 2007 - and has been adequate to maintain the indoor temperature above 65°F/18°C since that time – even though outdoor temperatures in winter dropped below -20°F/-29°C
525.
by samcheng 10y ago
The funny counterpoint to those people is that the Tesla Model S IS a 5-door hatchback! (Albeit a big one) It IS possible to make a "better" AND a "prettier" car at the same time. They aren't mutually exclusive...
526.
by samcheng 10y ago
The New York Times has a longstanding anti-Tesla bias. http://www.nytimes.com/2013/02/10/automobiles/stalled-on-the... http://www.nytimes.com/2016/06/11/business/tesla
527.
by samcheng 10y ago
RINSE | San Francisco, CA and Santa Monica, CA | Full Time Rinse is a technology-enabled dry cleaning and laundry delivery service. We've grown at double-digit month-over-month rates for over three years now, our business fundamentals
528.
by samcheng 10y ago
We're not likely to iterate on thermonuclear war, though!
529.
by samcheng 10y ago
I was just thinking about how the Google Self-Driving Car effort has become more aggressive recently. On a five-mile drive through Mountain View this afternoon (on El Camino and a residential neighborhood) I saw FOUR of the little bubble c
530.
by samcheng 10y ago
RINSE | San Francisco, CA and Santa Monica, CA | Full Time Rinse is a technology-enabled dry cleaning and laundry delivery service. We've grown at double-digit month-over-month rates for over three years now, our business fundamentals
531.
by samcheng 10y ago
I was instructed (from professional chemists) to NOT drink 1 MOhm ( or other highly-purified) RO water. At that purity, particularly when hot, it will leach metals and other compounds from pipes, pots, cups, etc. Maybe it's worth dro
532.
by samcheng 10y ago
We'll know automated cars have truly arrived when they start using the horn against humans.
533.
by samcheng 10y ago
Here's my experience outside the vehicle - I live about two miles from Tesla HQ in an area where electric vehicles of all types are common, and bike frequently in close proximity to motor vehicles. You're right that there is still
534.
by samcheng 10y ago
Maybe automated trucks won't need that beep, once they can be trusted to stop before crushing anyone behind them?
535.
by samcheng 10y ago
Having daily driven a dual-motor electric car, two turbodiesel cars (both modern and classic), and a modern Honda V6, I can tell you that the electric car is significantly quieter, especially at lower speeds and when accelerating, both insi
536.
by samcheng 10y ago
I've never seen a hydrogen tanker. Have you? At that point, you might as well ship LNG or refined gasoline.
537.
by samcheng 10y ago
Once you start filling your electric car every night from a plug in your garage, the idea of (weekly?) driving to one of a handful of special hydrogen fueling stations is seriously unattractive. In fact, filling up the old gasoline car bec
538.
by samcheng 10y ago
I was surprised at how efficient a heat pump can be! Research SEER. A new A/C unit has a greater-than-300% efficiency. Heat pumps can be used for heating, too, but they're expensive and commonly involve drilling wells for geothe
539.
by samcheng 10y ago
I too doubted the assertion that it's easier to cool in a warm climate than it is to heat in a cool climate. So I compared Stockholm, Sweden to Phoenix, Arizona USA. Sweden averages about 4,000 heating degree days, while Phoenix aver
540.
by samcheng 10y ago
1 point by samcheng 90 days ago RINSE | San Francisco, CA and Santa Monica, CA | Full Time Rinse is a technology-enabled dry cleaning and laundry delivery service. We've grown at double-digit month-over-month rates for almost three yea

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