Michael Herf

@herf

I make f.lux, models, and data to understand circadian and sleep behavior. Previously: Picasa co-Founder/CTO, Google, MetaCreations.

Liittynyt heinäkuu 2006

Twiitit

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  1. Kiinnitetty twiitti
    20. maalisk. 2019

    I just published "Why Standard Time is better"

    Kumoa
  2. 4. huhtik.
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  3. 3. huhtik.

    Things that correlate with higher vitamin D: Being white, male, lower BMI, exercise. Uncorrected association studies don't tell us as much as people say.

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  4. 31. maalisk.

    50% chance: caution when daily case rate < 80 10% chance: case rate < 13 5% chance: case rate < 9 2% chance: case rate < 5/100k btw this is California

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  5. 31. maalisk.

    Suppose you have two states: A) Be like everyone else B) Exercise extreme caution and use your N95 in your mountain cabin with HEPA filters When case rates are "low" you do A and otherwise B. Here's the chart of how picking different case rate thresholds influences your chances.

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  6. uudelleentwiittasi
    27. maalisk.

    Was invited to write an opinion piece on my thoughts about daylight saving time. Spoiler alert…not a fan.

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  7. 29. maalisk.

    Does anyone write about music bubbles? Seems like we have less music in common than before everyone had a collaborative filter in their pocket.

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  8. 25. maalisk.

    I tried to take a picture of the fog, and my iPhone took it out.

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  9. 24. maalisk.
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  10. 24. maalisk.

    LA public health reported a backlog from a lab during the Omicron surge. Usually backlogs don't appear in only one geographic region, but it certainly could happen like that. Here is the one-day data for some more detail.

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  11. 24. maalisk.

    Los Angeles BA.2 watchers: I added a "hotspot" search. Right now, Claremont area is main place going up. Not much bounce otherwise, it's still quiet.

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  12. 23. maalisk.

    When we stop with single variables, often we miss how layers work together.

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  13. 23. maalisk.

    Wonderful stats here - yes 6ft distancing is *actually* better than 3ft. But, the difference is MUCH BIGGER with ventilation. Then air is diluted (mixed) at 6ft and the air at 3ft is still bad. This paper makes a super-compelling case for this:

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  14. 21. maalisk.

    My current desktop display is over ten years old. Does this mean iOS will be supported that long on A13 chips? Would be quite a record.

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  15. 21. maalisk.

    This DST choice is a form of "light therapy" due at least to commutes. While we'd hope people spend time outdoors many times a day, having the sun be up during the daily commute is especially important.

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  16. 21. maalisk.

    Summary of Wirz-Justice 1998 "Beginning to See the Light". Does morning or evening light help people with depression more? It has been surprising to see so many people (including a Senator) say that an increase in evening light is the way to help those with depression.

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  17. 18. maalisk.

    Espresso homeostasis: the tendency to space out when tired and pull longer shots.

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  18. 18. maalisk.

    Also, measurement. My WTF moment was like: my huge online study has no minorities in it?!

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  19. 18. maalisk.

    Totally. "I want light after work" is the same as "All my best, alert hours should not belong to my employer." No employer wants people to show up groggy and still asleep.

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  20. uudelleentwiittasi

    “In their zeal to prevent the annual switch, the Senate has unfortunately chosen the wrong time to stabilize onto,” said Dr. Charles Czeisler

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  21. uudelleentwiittasi
    17. maalisk.

    Happy to say our consensus recommendations for healthy light exposure are now officially published Thanks to the many expert contributors, including:

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