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: measuring the hardness of minerals requires scratching those materials. 
Fact 2: Most gem stones are hard minerals.
Example Output: You can measure the hardness of a gem stone by scratching it.

Example Input: Fact 1: Earth 's magnetic patterns are used for finding locations by animals that migrate. 
Fact 2: Spring and fall migrations of birds and fish animate the landscape.
Example Output: Earth's magnetic patterns are used for finding locations of birds and fish.

Example Input: Fact 1: eating food that contains pesticides can have a negative impact on humans. 
Fact 2: Foods such as porous strawberries are hard to wash free of pesticides.
Example Output:
Eating unwashed strawberries can have a negative impact on humans.