| 1 | "We can make custom flies," notes Carroll. | |
| 2 | So the scientists set out to search for the fly genes involved in alcohol sensitivity. | |
| 3 | Repeated doses of booze led male flies to start courting other males. | |
| 4 | Some of the mice and flies lived for more than 900 days, he added. | |
| 5 | They can solve problems thatno individual fly in the evolutionary history of the species has solvedbefore. |