Strange creature

There was a student who was sent by a teacher to take a quiz. Entering the room, the judges asked:

- Do you know who invented the rabies vaccine?

The embarrassed student answered:

- Ephesus!

The jury asked:

- Is there a ghost in this world?

The student said:

- Scientists are studying!

The jury gave him the class. Arriving at the class, the teacher wanted to try to see how she would test and ask:

- What did Stephen invent?

The student who thought she pretended to try and replied:

- Vaccination against rabies!

The teacher was furious because her students were too bad and asked:

- Are you crazy?

He thought that the teacher asked him to repeat the sentence like the previous sentence.

- Ladies, scientists are studying.

The teacher said:

- Oh, so you're an alien.

The article was sent by Mr. Le Ho Hai to www.scienceinfo.net