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1.

Where was the research made available to the public?

2.

What does doing good deeds do?

3.

How many research papers were involved in this study?

4.

What did volunteers have lower levels of?

5.

What percentage of Australians volunteer?

6.

Why does a researcher think more work is needed?

7.

What are biological and cultural factors often associated with?

8.

What did University of Michigan researchers suggest?

9.

What do social connections help to do?

10.

What was the third reason?