The issue with putting stuff in space isn't the kinetic energy required. In LEO that's about 30 megajoules per kilogram or $5 worth of propellant. The issue is that orbital launch vehicles are not reusable, so you must destroy an expensive rocket to get your payload to orbit. All of these space datacenter efforts are betting that Starship will be fully reusable.

Who knows if they'll be able to pull it off, but an analysis that treats Tesla as a car company misses why investors have priced so much growth into the company.

I’m surprised they went down to one engine at the end, because that means they lose most of their roll control. The only way to roll with one engine is to use the cold gas thrusters, which aren’t nearly as powerful.

1. https://news.ycombinator.com/item?id=48215414

2. https://news.ycombinator.com/item?id=48220491

If you were using a 4k display and had the Sun and Alpha Centauri visible at opposite sides of the display, the orbit of Neptune would be in the same pixel as the Sun.

And they won't attempt a catch with the first V3 booster because it's not worth the risk. They can build a new booster every couple of months. It takes much longer to build the launch/catch tower, and they don't have any spare towers yet. A catastrophe during a booster/ship catch would set them back a year, so they'll only attempt a catch if they're confident it will succeed.

The level of salt shouldn't affect much. Adding up the chloride and sodium content gets you 684mg/L, which is on the low end of brackish water (500-30,000mg/L). The limit for agricultural irrigation is 2,000mg/L, and photos of the pipe show plenty of grass growing around and in the water.

The phosphorous could come from fertilizers, as there's plenty of farm land in the area. That would also explain the higher ammonium levels, as both anhydrous ammonia and ammonium phosphate are common fertilizers.

The article is really about how sensitive our scientific instruments are, not how dangerous the water is. It reminds me of articles like Vice's American Honey Is Radioactive from Decades of Nuclear Bomb Testing[3], where the most radioactive honey they could find was 10 times less radioactive than a banana.

1. https://www.waterboards.ca.gov/drinking_water/certlic/drinki...

2. https://www.sciencedirect.com/science/article/abs/pii/S00489...

3. https://news.ycombinator.com/item?id=26906838

In my opinion there isn't enough information to blame anyone for the slightly-above-drinking-water levels of hexavalent chromium. The drainage ditch goes along a highway and a rail line, so pollution could come from all kinds of places.

1. https://maps.app.goo.gl/7iNTbiPcs1sZ9CqP8

2. https://www.texisle.com/

1. https://www.tesla.com/support/insurance/fsd-discount

2. https://www.lemonade.com/fsd

1. https://trimet.org/about/pdf/trimetridership.pdf

If you divide passenger miles for TriMet busses (141,726,107) by the number of revenue miles (21,195,016), you get an average of 6.7 passengers per bus, or around 10% of available seats. For MAX (the train) you get an average of 27.4 passengers per train, or around 16% of available seats. In both cases that's seats, not total capacity including standing room. I realize it's important to provision the system for peak demand, but still this seems very wasteful.

And because road wear scales with the fourth power of axle loading, a bus will typically cause 1,000x more road damage than a car.[2] Assuming every car on the road has only one occupant, this means that, on average, a TriMet bus causes 150x more road wear per occupant. The main externality created by cars is traffic.

I agree with you that public transportation can work. It clearly does in many places. But Portland's public transportation is dysfunctional, and I don't see that changing any time soon. That's why substitutes (even partial substitutes like Waymo) are beneficial. The more options people have for getting around, the better off they'll be.

1. https://trimet.org/budget/pdf/2026-adopted-budget.pdf

2. https://www.kgw.com/article/news/verify/yes-bus-more-road-da...

For comparison, a Lyft or Uber in the same area would cost you $1-2 per mile. Obviously it's not feasible for all 200k daily riders to take Uber/Lyft, and the Uber/Lyft cost doesn't include externalities like extra traffic, but TriMet is very expensive per passenger mile.

1. https://trimet.org/about/pdf/trimetridership.pdf

There are other considerations as well. For example, available ride shares can scale up/down with demand, while Waymo & competitors will need lots of spare vehicles to satisfy peak demand.

I'm certain autonomous vehicles will eat up the market currently held by Uber/Lyft/Taxis. It's just going to take longer than a lot of people expect.

Waymo passed 200 million driverless miles in February. If we optimistically assume they're up to 300 million miles now, and every mile was paid for at $10 per mile, that's $3 billion in revenue since they launched. In that same time, Waymo has gotten $27 billion in funding. Of course they haven't spent anywhere close to that amount, and they are optimizing for faster rollout rather than profitability, but the finances aren't as gleaming as one might expect.

I'm sure Waymo will figure out ways to reduce their costs over time, but right now I think they're charging pretty close to what they need to break even.

Will you take the bet or not?

1. https://www.reddit.com/r/SelfDrivingCars/comments/1qqlpgg/un...

2. https://waymo.com/blog/2025/12/autonomously-navigating-the-r...

Nowhere in this thread am I claiming that FSD is safe enough to be used without human oversight. I'm also not claiming that Tesla has delivered on their promises (they obviously haven't). I am comparing the capabilities of autonomous systems using evidence that is publicly available. Since we don't have comparable statistics across manufacturers or some sort of standardized road test, I think "miles between human interventions" is a useful measure of autonomous capabilities. That's what has been used to demonstrate safety of other autonomous systems, and I see no good reason why such a metric should be ignored in this case.