Cavity quantum electrodynamics Updated +Created
Everything can break everything Updated +Created
Whenever someone asks:
I can only see this one thing different our setups, do you think it could be the cause of our different behaviour?
you don't need to read anymore, just point them to this page immediately. Virtualization for the win.
libpng Updated +Created
Little Boy Updated +Created
Uranium-based, dropped on Hiroshima. The uranium was enriched at the Clinton Engineer Works.
Rorogwela Updated +Created
Video 1.
Rorogwela by Afunakwa (1970)
Source. Later used as a vocal sample in the Sweet Lullaby by Deep Forest (1992), which notably featured in Where the hell is Matt (2006), an early YouTube viral video. The original destroys the Deep Forest version however.
Cauchy boundary condition Updated +Created
Sets both a Dirichlet boundary condition and a Neumann boundary condition for a single part of the boundary.
We understand intuitively that this imposes stricter requirements on solutions, which makes it easier to guarantee uniqueness, but also harder to have existence. TODO intuitively why hyperbolic need this extra level of restriction.
Causality and quantum jumps are incompatible Updated +Created
If something does a quantum jump, what causes it to decide doing so at a particular time and not another? It is expected that a continuous cause would have continuous effects.
This concern was raised immediately by Rutherford while reviewing the Bohr model in 1913 as mentioned in The Quantum Story by Jim Baggott (2011) page 32.
CCP dynasty Updated +Created
Four arts Updated +Created
Four Beauties Updated +Created
Figure 1.
A modern rendition of the four beauties
. Source. TODO we need a decent older one with CC BY-SA, and illustrating their attributes! Wikimedia failed me.
Four Treasures of the Study Updated +Created
Video 1.
Four Treasures of Chinese Study by a journey of culture (2022)
Source. Over the top and likely without copyright.
Video 2.
Four Treasures of the Study by Li's Ink World (2021)
Source. A more realistic down to Earth one.
Three Hundred Tang Poems Updated +Created
Bash (Unix shell) Updated +Created
The more heavily a project relies on it, the more you start to regret it.
Celestron NexStar Updated +Created
Video 1.
Celestron NexStar SE Tutorial by Astronomia UK (2022)
Source. Meh! ;-)
U.S. Securities and Exchange Commission Updated +Created
Center (group theory) Updated +Created
Champaign-Urbana metropolitan area Updated +Created
It is quite comical that two separate towns were founded one next to the other right in the middle of nowhere. And that both have so slightly weird names.

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