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: tectonic plates being pushed together causes earthquakes. 
Fact 2: Plumbing is sometimes damaged during an earthquake.
Example Output: Tectonic plates being pushed together can damage plumbing.

Example Input: Fact 1: recycling has a positive impact on the environment. 
Fact 2: Steel is a recycled and recyclable product.
Example Output: certain Steel products have a positive impact on the environment.

Example Input: Fact 1: telephones are used for communication by two people by transmitting sound. 
Fact 2: Sound Sound waves are mechanical waves.
Example Output:
Telephones are used for communication by two people by transmitting mechanical waves.