Hello @nitego, thank you for commenting!
The reason I'm able to do this is because, both the right and left side of my brain work simultaneously. Usually when writing, people only use one side of their brain: right side for left-handed and vice versa.

I first started writing with my left hand when I was in grade 1. I remember a funny incident: my teacher scolded me to write with my right hand and, on the spot, I changed the writing hand and effortlessly continued writing with my right hand, as if I've been doing that all along!
Teacher: "When you can write using the right hand, why write with the left?"
Little did she know that this was a skill haha!

Fun fact: I can write and speak about different subjects simultaneously, with no problem; I could be talking to you about the weather while writing an essay on flowers. :)