Advent Calender - H_H

13th

(1) Riddle:

I am always with my brother. You see him but not I. You hear me but not him. Who are we?

Answer to previous:
The tallest mountain was still Everest, it just hadn't been discovered.

(2) Shout-out: to a random follower:

hofrson

(3) Fact:

There is a condition where every letter, number, day, month, sound and word has a specific colour allocated to it. It changes from person to person who has the condition, but the colours of the words, letters or numbers hardly change. It makes your memory better and is called gratheme-colour synaesthesia. Most people with this see the letter 'a' red and the letter 'o' white.