History of History

The great Russian physiologist Ilya Mechnikov worked in France for a long time, studying various diseases. In Paris, he accidentally insulted a French aristocrat. He decided to learn the Russian knight, calling him to a duel.
The second came straight to the Laboratory of Mechnikov.
No excuses are accepted, the duel will take place anyway.
The French scientist. According to the rules, for those who are called to
Duel, the right to choose weapons. Which will you choose?
- Well, - I shrugged the shoulders of the Swordsmen, - I choose a bacteriological.
The weapon. Here are two glasses of liquids. He showed the capacity a little.
The Frenchman. They are externally no different from each other.
But in one - clean drinking water; in the other - water with bacteria
The Siberian ulcer. Your Count is free to drink any of these glasses, and I will drink.
The remaining.
A second silently turned away.