Viewing profile — phdp

Epicycles in a geocentric model of the solar system is another way of looking at planetary motion. It breaks down due to the required addition of complexity to explain discrepancie…

No it isn’t! The headline they used is “Protecting Our Customers - Standing Up to Extortionists.” My issue with it is that they word their announcement in a way that leads people t…

My iphone can't kill someone else moving 70 mph down the highway during the normal course of its operation.

Blackstone was never a division of Blackrock

Blackrock is not buying individual houses. Are you confusing them with Blackstone, who did own a unit that bought and rented single family homes?

Think of it as the opportunity cost. If interest rates are high, I can go out and buy a us gov't bond at x% risk free. This makes other investments that maybe looked attractive at …

No one else does what the USPS does. No one else does daily rural mail delivery. The USPS is also not tax subsidized.

A solar sail doesn't work via aerodynamic lift. It works on conservation of momentum. Also, the biggest contributor to force on a solar sail is not solar wind, but radiation.

I imagine that, just like airlines use futures to hedge the price risk of jet fuel, they do the same for their vast logistics operation. They can lock in prices so they aren’t sudd…

It is different though. The FDIC would force the bank into receivership and return the insured money to account holders. That doesn’t exist for tether.

Philip Greenspun is not a no one when it comes to aviation. https://philip.greenspun.com/flying/resume While he doesn't have 737 experience, he's far from an armchair quarterback.

He sent shorts to David Einhorn https://markets.businessinsider.com/news/stocks/elon-musk-ma...

I know quite a few finance companies use it - Morgan Stanley and Goldman Sachs come to mind.

It’s largely there to sound scary. While stocks can have their exposure measured based on their face value, derivatives cannot. For example, you could have a 100 million interest r…

Newt Gingrich too on Parks and Rec.

Neither of those are fighting words. See trope 7 from Ken White, a noted lawyer and first amendment expert - https://www.popehat.com/2015/05/19/how-to-spot-and-critique-...

You don't. You pull up your password on your phone and type it in manually onto the computer.

> Uhm, "traffic at terminal ends" suggests the real problem is that the correct path is not known in the beginning, or that autopilot might not be able to avoid collision on its ow…

> OK, so I don't have much of an expectation for older plane models, but my interpretation of the above is that in newer models, autopilot need not disengage before landing and req…

It would be like looking at a map of California and expect to be able to get around San Francisco - the aeronautical charts are generally for long haul navigation purposes. There a…

Not true at all. https://www.aopa.org/go-fly/medical-resources/health-conditi...

This already exists. Runway is lit up in white, has a green strip of lights at the close end as you look at it, and instrument rated fields have a chase strobe that points right to…

Why should they? If there are dangerous items to be disposed that 99.99% of the people on a given garbage day don't throw out, should the other people subsidize the disposal? Most …

NYU is not an Ivy League school though.

NYU is not an Ivy League school though.