BB84

See also Brand-new colour created by tricking human eyes with laser - News - nature.com.

It's not just the narrow wavelength. Even with a perfectly monochromatic green light, your green receptors would activate a lot but your receptors for red and blue would still activate a bit. These researchers specifically target only the green receptors to activate (by literally shooting light at those receptors in particular), so for the first time ever your brain reads a pure green signal.

It's a math trick. Not a physical theory.

Scientists have came up with countless ways to fix the Hubble tension. But all these modified theories so far are either

• contrived
• untestable with present day observational instruments
• currently being tested
• already tested and deemed incompatible with reality.

Any linear relationship in this calculation would be an approximation. They're useful for intuition and quickly explaining things, but for actual business either the full nonlinear relationship is used, or if the linear approximation is used the approximation error must be bounded by an acceptably small parameter.

Lambda-CDM is fully aware of general relativity. Some people may try to explain it with nonrelativistic pictures to help you build intuition, but the actual theory and calculation is fully relativistic so you don't have to worry about that.

since we have 2 parameters to evaluate

I don't follow. What two parameters?

The instrumental error bars are no longer overlapping. But if we imagine all the modifications one could make to Lambda-CDM, then there is still a huge "theory" error bar that subsumes all these.

Basically I'm saying the model is wrong, yes, but it can very much be fixed.

thing I don't like is on the rise

must be the tankies

Yes it's a problem with the model. But it a problem that can very likely be fixed. We don't have to throw out the entire model and start from scratch.

The article over-dramatizes the story. This "deeply wrong" discrepancy is less than 10%. CMB measurements predict a Hubble constant of around 68km/s/Mpc. Distance ladder measurements get around 73km/s/Mpc.

Our current understanding of the universe the Lambda-CDM model is still wildly successful and it's more likely that the true correct model of the universe will be a correction/extension to Lambda-CDM rather than a completely new theory (although if it is a completely new theory that would be pretty cool).

tariff = (export - import) / (<??? factor> × <another ??? factor that cancels the first one out> × import)

The only times anyone would use the asterisk as multiplication symbol are

• they are doing some fancy math and it's not the same kind of number multiplication we're familiar with
• they are on a computer, the keyboard does not have a (×) key, and they don't know how to typeset it (\times in LaTex), so they just use the asterisk instead

The US government falls in the second category.