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 devised the law of conservation of energy?" whose answer is Julius Robert von Mayer.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who devised the law of conservation of energy
Useful Output:

Doc 1: ) discovered by Einstein. This new law is called the law of conservation of mass and energy. It states that although mass may convert to energy
Doc 2: This law stated by Émilie du Châtelet, means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred
Doc 3: Richard Feynman, a Nobel Prize-winning physicist, used wooden blocks to explain the conservation of energy. This is a law that states that
Doc 4: What is the Law of Conservation of Energy? The law of conservation of energy states that energy can neither be created nor be destroyed
Doc 5: In 1877, Peter Guthrie Tait claimed that the principle originated with Sir Isaac Newton, based on a creative reading of propositions 40 and 41 of the