Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.

Example Input: Fact 1: pollutants have a negative impact on the environment. 
Fact 2: Incineration is harmful to the environment, it pollutes.
Example Output: inceneration is harmful to the environment.

Example Input: Fact 1: touch can be used for detecting texture. 
Fact 2: The skin is richly supplied with nerves that enable the perception of pain, touch, heat, and cold.
Example Output: Nerves are used to feel texture.

Example Input: Fact 1: optical tools are used for observing materials up close. 
Fact 2: Optical tools Apply and distinguish between optical comparators, optical flats, and microscopes.
Example Output:
Microscopes are used for observing materials up close.