Apple Heart Study Ends for Some Early Participants Ahead of January Completion Date

I am just saying that it sucks all smartwatches only show current heart rate and never analyze heart rhythm and I wish Apple finally added this so it becomes a standard.

The reason they don't is because they need data first. It's surprising, but the medical field really doesn't have a lot of data on "normal" because the data was really hard, if not impossible, to get. What are people's normal heart rate? What if you're really big? Really small? They have no idea, for the most part.

I'll bet it's unclear how accurate the sensors are, because to do that you have to compare your data against a known standard, and there isn't one. Do you really want to walk around with a nurse all day calibrating your sensor against a manually-measured value?

And even though the data from all these sensors is an amazing trove of data, but even you still need to correlate it.

The good thing is Apple and its partners are starting to do that.

Whew! I thought you meant it *ended* early for them.

Whew! I thought you meant it *ended* early for them.

Yeah I'm talking to you from down below.

I enrolled the day it opened as did my cousin. We both got the "complete" message at the same time this weekend.

Got the notification. 2175 contributions over 272 days.

Edison's early design ideas maybe. But DC scales better than AC today.

https://www.powermag.com/a-new-record-for-the-longest-transmission-link/

Um, no. That's talking about a high-voltage DC point-to-point connection. It's flipped to/from AC on both ends. Read the article you cited: "It consists of two 3,150-MW HVDC converter stations placed at either end of the line: at hydropower plants at Porto Velho in northwest Brazil and in the southeast near São Paulo (Figure 2). ABB also delivered an 800-MW HVDC 'back-to-back' station that transmits power to the alternating current (AC) network in the northwest of Brazil."

Nobody is using a network of DC lines for the power grid proper. No transformation from a DC high-voltage transmission lines to lower-voltage DC distribution lines. It doesn't work. West spells out why in Scale ('https://www.penguinrandomhouse.com/books/314049/scale-by-geoffrey-west/9780143110903/') -- it doesn't scale.

I despise AC. It's legacy we're stuck with now unfortunately probably forever. I dream of a DC only world.

As long as electricity is distributed through a grid, your dream is a nightmare. :( Power distribution from big generation facilities can only work in an AC world -- even in Brazil. Impedance matching is crucial.

Interestingly, our mammal circulatory network winds up being essentially DC at the capillaries -- the oscillations of our heartbeats winds up to zero at that tiny scale. That is also covered in West's book. If you wished to rectify your power from the electric company and be DC-only at your house, that would be fine. I think the engineering is fine; you may or may not run into some building code violations. Or just put a bunch of USB-capable outlets in your house -- run as much as possible off of USB.

Your "correction" ends up making my point: people have no intuitive sense whatsoever for electrical or mechanical systems that have stored energy -- and must be modeled with impedance. Understanding why the model is required and how it is applied has pretty well been beyond our comprehension. That's why I was so damn grateful that this book came out. Great thinking -- great concepts to learn.