I love adding different spices to my food, what about you?
I do love using them too. And I like how some of them have antimicrobial properties.
What does that mean?
It means that it contains an agent that inhibits the ability of microorganisms to grow on it  
I never knew that and that is in all spices?
Not all of them, but I assume the ones that are sometimes used in medicine, religious rituals, cosmetics
That is good to know, what is something else that is unique about spices?
Cinnamon and black pepper are the spices that started the spice trade in South Asia and the middle east.