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: when metal conducts heat , that metal expands. 
Fact 2: Steel is a solution of metals.
Example Output: when steel conducts heat, it expands.

Example Input: Fact 1: nerves can be used to feel heat and pressure on the skin. 
Fact 2: There are two types of nerves in the body that can "feel" pain.
Example Output: Heat and pressure on skin can cause feelings of pain.

Example Input: Fact 1: Cells are programmed to divide only a set number of times. 
Fact 2: Parts means something has been divided.
Example Output:
Cells are programmed to split into parts only a set number of times.