"Silicon is my favorite material."
Translation:Το πυρίτιο είναι το αγαπημένο μου υλικό.
I also didn't understand this, so I looked it up. Silicon (without an 'e') is the chemical element, which is different from silicone (with an 'e'), which is a compound made up of silicon, oxygen, carbon and hydrogen. 'Πυρίτιο' is silicon and 'σιλικόνη' is silicone. I think silicone is the material more commonly found in everyday objects, which is why 'σιλικόνη' is more familiar.
Pretty confusing to only have one letter difference between the two!