I am grateful for

- Feynman Lectures on Physics. I'll eventually buy the remaining volumes but the first volume is really good. It also teaches you mathematics.

- Stephen Hawking. The only one person who made me interested in cosmology and the Universe. And the only one to give me the courage to pursue my own interests for my own sake.

- Neil deGrasse Tyson. I learn a lot just by watching this man talk.