Happy mother's day!

Definition of Mother's day on Simple English Wikipedia!

Happy mother's day!

Mother's Day is always celebrated on the second Sunday in May. 

It's not a federal holiday, however it's widely celebrated as a special day to honor all mothers and motherhood. 

Check out this lovely book from storybird.com!

* miss spelling: propogation → propagation  

<Vocabulary>

vegetative propagation : 식물 번식

leak out : 새어 나오다.

enrapture : 황홀하게 만들다, 도취시키다.

transgenic organism : 이식 유전자를 가진 생명체, 형질전환생물