Happy New Year RIddle

Round I start, yet no shape have I.
Allow me to breathe, and my life will die.
The older I grow, the more sought after I become.
You will feel much better when I am done.

What am I?

Ending the Year With a Difficult Riddle

An iron horse with a flaxen tail.
The faster the horse runs,
the shorter his tail becomes.

What is it?

(HINT: Think Small)

Riddle, of course

A house with two occupants, sometimes one, rarely three.
Break the walls, eat the boarders, then throw away me.

What am I?

Try This Riddle

Some say I'm their worst enemy,
Some say I'm their best friend.
Some use me in brevity,
You'll still pay for what I lend.

There's proof that I can even kill,
Too many take that path.
There's claim also that I can heal,
You'll have to do the math.

Yes, uses for me do abound,
You'll see me often, look around.

What am I?

Who Will Solve the Riddle?

Before I came, confusion abounded.
I'm late, I'm late was frequently sounded.

I'm not average, but was based on a mean.
My size, in theory, is constant: fifteen.

I'm two dozen steps, again in theory.
But walk my length and you'd get weary.

I take half and quarter steps at times.
In reality, I don't follow the lines.

I shrink to nothing in two cold extremes.
Over a thousand miles wide in the betweens.

What am I?

Let Us Commence Riddling

She's always ready to lend an ear
With hair so light
Too bad you she won't hear
The devil inside her
Is ready to burst
But lucky for you,
Of imps he's not the worst.

What is she?

Easy Riddle for You Today

I drift forever with the current
Down these long canals they've made
Tame, yet wild, I run elusive
Multitasking to your aid.
Before I came, the world was darker
Colder, sometimes, rougher, true
But though I might make living easy,
I'm good at killing people too.