Many researchers draw from the large available pool of twins at the festival to assist them with projects. A nominal compensation is usually offered for participation in a project -- possibly a bag of goodies, or a small amount of money.
Participation is entirely voluntary, and is subject to your meeting researchers' qualifications (age, sex, type of twin, etc.)
The list of the Research participants for the 2010 Twins Days Festival is still being finalized.
Further information about these research projects can be found by visiting the Research tent on the festival grounds.