How to find out if a tag is good to have/make I present to you, the MAR Tag Test™ (abbreviated as MATT), a short test with three possible responses to each question, designed as a crude way of diagnosing the health of a (imaginary) tag. Imagine X, a tag$\,\ldots$ 1: Ignore spam. Some people ...

I am a PhD in Chemistry, who graduated from a top 20 university in the US, failed to find a job in the field and moved to CS. Chemistry field doesn't have much of job security, so that was a good choice. I ask beginner's questions on StackExchange, but I want to pay back by answering questions on...

Is there a good mnemonic for remembering the difference between "stalactite" (hangs down) and "stalagmite" (points up)?

Let me give you another mnemonic, closer to the heart of some: Stalactite = tit Stalagmite = you already remembered the tit one This is how we remember it in Dutch, in which language it actually rhymes: stalactiet - tiet.

Here is one from my secondary school geography teacher that I will never forget: stalactite --- ceiling stalagmite --- ground Stalactites hang from the ceiling; stalagmites rise from the ground. As long as you remember what c and g mean in those words, you will never confuse them!

Preliminaries There are many ways in which you can go about defining a "Buffer Capacity". A good intuitive way to start would be to say, it is tha maximum amount of acid (or base) the solution can tolerate before it starts showing a significant change in pH. While this is not bad, it obviously b...

The quantity on the right side of the expression for the product of uncertainties basically depends on the mathematical definition of "uncertainty" used. Without rigid definition of this quantity one ofthen just say that the product of uncertainties in position and momentum is of the order of Pla...

You may be confusing two things here. The uncertainty principle, which states that for any two observables $A$ and $B$ $$ \sigma_{A}\sigma_{B} \geq \frac{1}{2}\left|\langle[\hat{A},\hat{B}]\rangle \right| \, , $$ can be derived (see, for example, Proof of the Schrödinger uncertainty relation ...

An experience a lot of us might've had; a dry cell (not completely depleted) when left in an electrical device for long periods of time, has this viscous fluid coming out that usually corrodes the terminals of the battery. I almost always find this fluid, present as a sorta thin film over the te...

As I mentioned in comments, professor Jack Simons offers a relatively simple physical interpretation of the idea of mixing in excited detrminant for treating dynamical correlation in his book "Quantum Mechanics in Chemistry" (Chapter 8) freely available here, as well as in this video which is als...