* Black joke
 
There was a some laboratory. A student said his teacher "Teacher,I have found
out how to live in safety. And I'll try them in those way from now on.
I'll report you of those results after tree monthes."
Term has passed,but there is no conect from a student.
 
So, a teacher visited to his an apartment.There was a dead body which had a
skeleton yet. A teacher fond out a paper on the desk.
A student had writtrn on a paper "How to live in safety, those are don't eat,
,don't breathe ,don't drink,and don't move."
 
In 22th aplil was The erath day 1990. So,I tried to participate in this event,
but,I thought that the best participation was nothing to do.
And,I had sleeping all day long.Nevertheless,I made air dirty a little.
What can I do on the whole ?