1.   Investigators only recently claimed to have perfected ways to deliver the therapy into the cells where it can do some good.

2.   Recently, a couple of cycling Houdinis have perfected ways to fold or disassemble bicycles, making it easier to take it along.

3.   Unfortunately, we have yet to perfect a way of managing hypocrisy with the Italian flair.

4.   Using statistical models, researchers are perfecting ways to detect people who copy answers from nearby test takers.