False. You can bend the leaf of a cherry MX switch into all sorts of wild shapes to move the tactile event up and down the press, but the actuation will stay in largely the same place. If you browse the force curves from the link I posted above, you can see that some switches (cherry MX Brown, for example) actuate well after the tactile event.

The tactile event on a Cherry MX Brown is ~1mm into the travel distance, and the actual actuation is ~2mm in. Kaihua Box Orange switches (still an MX-style switch) is an even better example of that. Kaihua Speed Bronze has the actuation point inside of the tactile bump instead of after the bump. I can't find any examples of switches that actuate _before_ the tactile bump (mostly because why would anyone design that?), but tactility and actuation are not inherently tied together in cherry MX switches, either.

They are both handled by a two-part leaf, which you can sort of see in some of the pictures on Deskthority[1]. There are two legs on the slider that have a surface to them that determines the tactility (or lack thereof in the case of linear switches) that slide linearly up and down the top leaf, which flexes it until it makes contact with the bottom leaf. That contact causes the actuation. All of the tactility is determined bu the shape of the slider legs.

[1] https://deskthority.net/wiki/Cherry_MX#Construction

Great post - I quite like the stackoverflow.com style of `stackoverflow.com/questions/<question-id>/<question-title>`, where <question-title> can be changed to anything, and the link still works.

This allows for easy URL readability, while also having a unique ID.

In the context of this post (the library example) that would look like

library.com/books/1as03jf08e/Moby-Dick/

For the same reason Google's TPU was an order of magnitude more efficient than Nvidia's previous "pure" GPUs, or why video codec accelerators are also faster and more efficient than GPUs for video decoding. The GPU is still pretty "general purpose" compared to a chip that only does image processing and not much else.

I hope Google will eventually reveal if the IPU shares any DNA with the TPU at all.

We can accurately predict lensing well enough to see the impact on particles of light - over billions of miles. We can't explain it.

The universe is still full of many mysteries. If we knew the why, we'd stop doing science. Our understanding is incomplete and that's okay. It gives our species something to strive for.

Do you really understand particle physics well enough to truly understand how your cell phone works? We can predict, model, and observe. We can get results. We don't necessarily know or why the results are the way they are.

Edited to add: I find it interesting enough to sometimes point out that we used electricity before we even knew about electrons. Being able to do something doesn't mean understanding.

We used simple machines, long before we understood them.

>In tacticale switches the bump and the making of the contact are mechanically connected.

Nope! This is rarely (if ever?) the case. In alps switches, for example, there are two totally separate leafs, one of which handles the tactile feeling and the other of which is responsible for the actual actuation. If you browse through Haata's Plotly[1] you can see that many switches actuate well after the tactile bump. Though they are often pretty closely related in terms of their depth in the keypress, they are wholly unrelated from one another mechanically.

[1] https://plot.ly/~haata

That's effectively providing a definition of the latency he's discussing, not an explanation of why that's the sort of latency he finds interesting.

But I see he does goes on to say that he cares about game performance, rather than typing experience: « If, for example, you’re playing a game and start dodging when you see something happen, you have pay the cost of the key movement, which is different for different keyboards. »

For me, I don't care about the time after switch activation, rather about time after the tactile feedback (the "click"). Ideally the character would appear on the screen at the same time as the click; not after, and not before. If a keyboard can 'cheat' and activate the switch before that and hide some latency, that's fine by me.