Question: In order to ask the questio0n, I need to explain the context:

**Background:**

I was in discussion with a friend(Annie), talking about one of our friends, James.

He was filming a video documentary for his PhD thesis about Chinese music. Unfortunately, we lost him about 3 years ago due to stroke. 

During the discussion, I mentioned a concept in Chinese:时代相关性, which means the documentary has its relevance to today's world. In another words, the documentary makes perfect sense in the current world, but may not be relevant after 2 decades or whatever the time could be.

I searched online and found 2 words:

**Relevance** and **Correlation**

So here is my question:

**In this context, which one fits the best and why?**

Answer: 
"to alleviate the many ills to which the flesh is heir" = "to alleviate all the bad things that humans suffer.

The expression *to which the flesh is heir* is taken from Shakespeare's play Hamlet (Act 3 Scene 1).

> 
> To die, to sleep—
> 
> 
> No more—and by a sleep to say we end
> 
> 
> The heartache and the thousand natural shocks
> 
> 
> **That flesh is heir to**—’tis a consummation
> 
> 
> Devoutly to be wished!
> 
> 
> 

*To which flesh is heir* or *That flesh is heir to* is a poetic way of saying "that afflict us" (literally "that our bodies inherit")

**Flesh** means "mortal body", and is as opposed to the spirit or soul.
"Flesh" (in this sense) means "humans". "Is heir to" means "inherits". And it's "The heartache and the thousand natural shocks" of living that humans inherit.