Well, not exactly "works every time" since things got all Quantum. Science is now beginning to deal with two areas espoused by the prayer/magick crowd for some time:

- the answer is sometimes "no" (Science: results are often based on probability and the probability doesn't go in the direction you were testing, though it does sometimes)

- observation affects that which is observed (Magick: a non-believer can cause the experiment to fail)

Things may be a bit more dicey than Einstein expected.