You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who discovered positive and negative charges in atoms?" whose answer is Michael Faraday.
Each document should contain about 30 words, and these documents should contain useful information.

Query: discovery of positive and negative charges in atoms
Useful Output:

Doc 1: Sir JJ Thomson first proved the existence of negatively charged particles within an atom called electrons. Thus, the electron is the first sub-atomic particle
Doc 2: Scientists have known since the late 19th century that the electron has a negative electric charge. The value of this charge was first measured
Doc 3: This happens because electrons have a negative charge that interacts with the positive charge of the nucleus of an atom. In a neutral atom the number of
Doc 4: Thomson proposed that the electrons were embedded in a uniform sphere that contained both the positive charge and most of the mass of the atom,
Doc 5: Thomson had envisioned the atom to be a small sphere in which equal amounts of positive and negative charge were distributed evenly. The