Physics- It includes all the cosmosian theories and all the inventions. It gives new dimension to the mind about the possibilities of the world.
Maths- Coz I love it. Like I seriously love it. There is nothing better than this, apart from Physics.
Chemistry- Coz I was a topper in it. Don't remember much now.
P.S.- Good to see your quality of Topics improving after being elected as a Mod.