ggreer

20 ms·

241.
by ggreer 2y ago
There is no country in which cycling is safer than driving. Even in the Netherlands, the fatality rate is 13 deaths per billion miles. For comparison, the Netherlands has 3 deaths per billion miles by car.
242.
by ggreer 2y ago
That logic also applies to flying versus driving, but few make the same objection when someone points out that flying is safer than driving. And at the margins, cycling does substitute for driving, just as driving sometimes substitutes for
243.
by ggreer 2y ago
According to the NTSB, cyclists have 79 deaths per billion miles traveled. For comparison, cars were 11 per billion miles. Around 2/3rds of bicycle fatalities involved a motor vehicle. So even if we solved car-bicycle collisions, the f
244.
by ggreer 2y ago
It's quite difficult to convert a combustion engine vehicle to an EV. - EVs need significant volume for batteries. The only places available in a combustion vehicle are the engine bay and the gas tank. If you put batteries in the engin
245.
by ggreer 2y ago
This article claims that 12 million tons of food are wasted in California annually, and that this law will save 70,000 tons of food from going to waste. California's population is 39 million. Does that mean that every Californian is wa
246.
by ggreer 2y ago
I was curious why direct-to-cell hasn't been enabled everywhere, and it looks like it's because AT&T claims it would cause them an 18% decrease in network throughput/capacity. AT&T petitioned the FCC to block direct-t
247.
by ggreer 2y ago
Both, but the stage 2 FTS is safed near the end of the second stage burn, right before it has enough velocity to be in orbit.
248.
by ggreer 2y ago
The kinds of people who own 1st gen Roadsters are willing to pay for a flatbed. My point is that they can be repaired, not that they can be repaired conveniently. It’s a similar story for all cars with such low production volumes. I’m point
249.
by ggreer 2y ago
Chargers and payments are a solved problem. The charging ports are standardized (NACS in North America & Japan, GB/T in China, and CCS2 everywhere else). The protocols for automatic payment are also standardized. Some EVs made by o
250.
by ggreer 2y ago
The important thing is to get a vehicle that is popular enough that there will be future demand for maintenance. That way even if the manufacturer goes under or drops support for that model, other companies will take up the mantle. This thr
251.
by ggreer 2y ago
Some of the orders were not just to prevent people in Brazil from viewing certain things, but to take down content and ban users globally. The court also wanted Twitter to provide personal information of overseas accounts.
252.
by ggreer 2y ago
The 250 mile range is with the buffer. Beta Technologies has flown their CX300 craft 386 miles on one charge.
253.
by ggreer 2y ago
It's not about weight or efficiency. If operating costs are lower, it will win out eventually. Current electric aircraft can carry 5 passengers and have a range of 250 miles. They cost half as much to operate per hour, because electric
254.
by ggreer 2y ago
We already have prototype electric aircraft. As battery costs decrease and battery performance improves, it makes perfect sense that aircraft will electrify. The reason for this is economical, not environmental. Electricity is cheaper than
255.
by ggreer 2y ago
Ah, that makes sense. I would definitely not do 24k gold for anything with a smooth or regular texture. I was curious how durable my gold ring was, so gave it bit of a torture test. I did some weight lifting with it, grabbed some knurled pu
256.
by ggreer 2y ago
Yeah it took a while to melt the ends together. I think maybe six attempts. I should have punched a hole in the gold bar, then shaped the ring from there. I know that pure gold is much softer than alloys, but the color is unique and it&#x27
257.
by ggreer 2y ago
I just used the numbers from Wikipedia, which says that gold is 19.283g/cm3 and tungsten is 19.254g/cm3. 1. https://en.wikipedia.org/wiki/Gold 2. https://en.wikipedia.org/wiki/Tungsten
258.
by ggreer 2y ago
I looked around online and answers ranged from no shrinkage to 6%. For my first attempt I split the difference (3%), then measured the actual diameter with calipers. Also I tended to err on the side of making the ring too small, as it’s pre
259.
by ggreer 2y ago
What metal were the rings made of? When researching for this project, I did look up the densest metal possible: Osmium. Osmium has density of 22.59g/cm^3, which is 17% greater than gold's 19.28g/cm^3. (For comparison, lead is
260.
by ggreer 2y ago
I wasn't sure if centrifugal casting would solve the issue with oxygen bubbles, and since I already had a vacuum pump, I figured I'd try vacuum casting. The main issue was that I had problems getting a good seal because I made the
261.
by ggreer 2y ago
How did you deal with the molten silver dissolving oxygen from the atmosphere? Even if you keep it under a reducing flame, you'll have to take the flame off eventually and some O2 will get in, which will cause defects as the metal soli
262.
by ggreer 2y ago
Yeah, hindsight is 20/20. As my blog post mentions at the end, I had no trouble forging a gold ring. Though instead of using solder, I melted the ends together as I wanted the entire ring to remain pure gold. Had I wanted a faceted ham
263.
by ggreer 2y ago
I was worried about the metal shrinking, but I only had to increase the size of my prints by 1.6% to get the desired ring size. eg: The PLA ring had an inner diameter of 16.8mm and the casting had a diameter of 16.5mm. Thanks for the info a
264.
by ggreer 2y ago
These sorts of failures are usually caused by people constructing the potato cannon out of thinner schedule 40 PVC (usually colored white). If you use schedule 80 PVC (which tends to be dark gray) or ABS (which deforms instead of shattering
265.
by ggreer 2y ago
It really depends on where you are in the world. Poorer countries often have older aircraft that are in worse states of repair. Most aren't exactly rust buckets, but they wouldn't be legally airworthy in places like the US or EU.
266.
by ggreer 2y ago
If it's a commuter car, you're plugging it in at home every night and waking up with a full charge.
267.
by ggreer 2y ago
You can't control what other people say to you. You can only control how you react. If obvious trolls like this upset you, then you are guaranteed to be miserable. Worse, if you publish troll emails like this and say that's why yo
268.
by ggreer 2y ago
Falcon 9's exhaust is almost entirely carbon dioxide and water vapor. If anything the exhaust is less polluting than aircraft or combustion vehicles, as air-breathing engines create nitrogen oxides.
269.
by ggreer 2y ago
SpaceX provides internet access. Millions of customers pay for it. The revenue from the customers is more than enough to cover the business costs. The negative externalities are much smaller than say... aircraft or cargo shipping. If a sust
270.
by ggreer 2y ago
What environmental impact? So far there have been 162 Starlink launches. Each launch uses around 200 tons of RP-1, which is equivalent to the fuel capacity of a Boeing 747. In other words: A single 747 burns more fuel in a year than all the

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