Answer:
I occur twice in eternity. And I'm always within sight.
What has hands but canβt clap?
What calls for help, when written in capital letters, is the same forwards, backwards and upside down?
I know a word of letters three, add two and less there will be.
In your fire you hear me scream! Creaking and whining yet I am dead before you lay me in your hearth.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?