samjohnson | 1 year ago | on: Kindle is removing download and transfer option on Feb 26th
samjohnson's comments
samjohnson | 3 years ago | on: Leaderless Teams
This is interesting, but it’s not obvious to me what “the capacity for an individual to attend to others in the group” means in this context.
It would be interesting to learn how that capacity was observed and measured. Has anyone seen the source research?
samjohnson | 5 years ago | on: Ask HN: What are some good resources to learn how electricity works?
> Then I realized that a 5V supply will always be 5V in normal operation and ohms law means the current varies.
This is a great observation. I've often thought that teaching Ohms law as I=V/R would lead to less confusion. Similarly, in intro physics why is mass acceleration introduced as f=ma? Wouldn't a=f/m have a clearer meaning?
samjohnson | 8 years ago | on: 100 Years Later, the Madness of Daylight Saving Time Endures
Are you missing that the quote is from a sentence listing example complaints and not actual affects of daylight saving?
samjohnson | 8 years ago | on: Show HN: Build A Personal Power Plant for $200
A Watt is an SI unit defined as 1 joule/second, and is used for measure rate of energy usage/generation. So this system generates up to 100 joules/second, and can output up to 150 joules/second (until the stored energy is consumed).
samjohnson | 9 years ago | on: Why I stopped hacking the Amazon Dash button and learned to solder
There's still significant savings at 5% usage:
100W * 5% * 24 Hours = 120Wh
1W * 24 Hours + 5W * 5% * 24 Hours = 30Wh
So it does depend on the duty cycle - As long as the 5W lightbulb with a 1W computer is used less than ~19 hours a day (80%) you'd still have savings:
1W * 24 Hours + 5W * 80% * 24 Hours = 120Wh
samjohnson | 9 years ago | on: By 2040, computers will need more electricity than the world can generate
Why is the world's energy production a constant value from 2010 to 2040? Surely we produce more energy today than we did 30 years ago. Is this just a chart scale issue?
samjohnson | 13 years ago | on: Polycode – Open Source, cross-platform framework for games and interactive apps
You might be interested in Cinder. It's a mature C++ library with multiplatform support: http://libcinder.org/
samjohnson | 13 years ago | on: E-Mail Security in the Wake of Petraeus
You almost can with http://gmvault.org/
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I recently got a Boox Palma, which I love, but the Android Kindle app can’t display time remaining in a chapter for emailed epubs. I find this very surprising, considering both the kindle hardware readers and iPhone kindle app have no problem doing this. Sharing this story in case someone else has run into this and identified a solution.