The not necessarily well-prepared student sat in his life science classroom staring at 
a question on the final exam paper. The question directed: 
"Give four advantages of breast milk."  What to write? He sighed, and began to scribble 
whatever came into his head, hoping for the best:

1. No need to boil.
2. Cats can't steal it.
3. Available whenever necessary.
4. Available in attractive containers.