In my first year of engineering (UBC), some 2nd years advised me to get an HP48 calculator. It was expensive, but worth the investment they said. I bought the 48GX, a 128KB memory card and some books... and glad I did. This calculator has served me well... but today some of the keys don't work as well as they used to. And I can't get a suitable replacement. I have and use an emulator on my phone and desktop - but its not the same. And the newer HP calculator keys don't feel great to me. In the meantime, I rely on the more reliable vintage HP15c (one built in the 80s with silicon on saphire and amazing keys).
I really appreciate SwissMicros building high quality clones of the best HP calculators. And I am super excited about what the hint of upcoming products based on Saturn Emulation. That must mean a DM48 is on the horizon!
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Are they expecting students to “sit in class” by watching a live zoom lecture?
Not only is it going to be challenging for the kindergarten kids to stay focused on their class via chrome book, the SAME teacher is managing the kids in the classroom and the kids online. The kindergarten teachers each have an assistant too (as they did before Covid-19) so that helps a bit.
I am fortunate my wife stays at home with the kids. I can't imagine what it will be like for parents of kindergartners who both work, or parents with special needs kids or parents who don't speak English. I am supportive of social distancing in these times. But its going to be tough on the kids.
https://en.wikipedia.org/wiki/RoboBOARD/FXhttps://www.reddit.com/r/bbs/comments/5eo8pz/roboboard_and_r...
If I wanted to buy a hackable mobile Linux device, I don't see why I would buy this instead of a PineBook Pro (when it comes out).
I would really hate typing on a silicone keyboard.
I can understand many mechanical keys types will not be feasible in a small form factor. But there are good mechanical key designs that are small to choose from. For example, the ones on HP calculators (ie HP48GX...) The DM42 (a modern HP42S clone) has nice mechanical keys.
Also what does the chemical reaction look like when harvesting hydrogen from ammonia?
https://en.wikipedia.org/wiki/Ammonia#As_a_fuel
(Note this is energy density by volume, which is the metric most care about. Energy density by weight of H2 gas is great, but the volume is enormous in comparison.)
https://en.wikipedia.org/wiki/Hydrogen_storage
Ammonia has been long recognized as a great medium for energy storage and you can generate at the site of electric generation. But the challenge has been extracting the hydrogen from the ammonia. My understanding is that hydrogen crackers exist, but have only been successful commercially at large scale. A portable cracker that you can put on a car that extracts hydrogen on demand from an ammonia storage tank is the innovation we need to see. Apparently there is work in Denmark that looks promising... (And now there is this new membrane technology from Australia.)
https://www.mvsengg.com/products/hydrogen/ammonia-cracker/
http://www.ammoniaenergy.org/ammonia-cracking-to-high-purity...
Personally, I am cheering for ammonia as a storage means. I am not a fan of batteries found in today's electric vehicles because there are too many conflict minerals in them. Maybe Tesla will succeed mining colbat in Colbat Ontario Canada... But until then, it is probably coming from the Congo or Bolivia.
https://www.washingtonpost.com/graphics/business/batteries/c...
https://www.bloomberg.com/news/features/2017-10-31/the-canad...