Thing spread like virus

Yesterday, when I ride home with my bicycle, I felt someone was look at me. She was a lady who has a small shop which I used to go for lunch back in those days before I left to Korea for study. I know her well, so I stopped by and had a small talk with her.
She was surprised to saw me that day. She thought I haven't finished my study in Korea. We exchanged our stories, catching up news. I said sorry for not visiting her earlier. Surprisingly, she was fine with that. She believed that I didn't know she moved he shop to another place (which is right next to her place before). That's why I didn't visited her after I came back. Such a positive lady.
I wonder, that's why her face look younger than her real age. She think positive. She enjoyed her life with her small shop.
I decided to wrap my dinner and went home. On the way home, I felt a positive energy from her. I felt more grateful with my present life. Well, it's true; one positive mind can spread like a virus.
So, think positive, do good thing. Who knows, it'll spread somewhere else.
Like a virus.

Two months has passed since I came back from my study and started working again in my office. They ask me to write something related with anything I've studied or learned there. Suddenly I got confused.. "What should I write?"
here some of ideas that came into my mind..
- what you choose on your dinner give big different for global future
- intra and interspesific variation in reproduction of crustacea
- waste water a problem or resource?
well, in sum, I still haven't decided my mind. What should I write...?
But soon, at least until last of this month, I have to submit my script.