The value of the cosmological constant is infamously the worst prediction ever made using quantum field theory; the math says it should be 120 orders of magnitude larger than what we observe.

The cosmological constant is technically just a constant of nature, a number in an equation that can take on any value, says Sabine Hossenfelder, a theoretical physicist at the Munich Center for ...

If you know that a particular model of IOL has an A-constant of 119.2 but then you switch to a different IOL with an A-constant of 118.7, you must then also drop the IOL power by 0.5, which is the ...