If you say, "I'm bursting with joy," a scientist could...

If you say, "I'm bursting with joy," a scientist could analyze your skin and find it loaded with neuropeptides that may have antidepressant effects and that may modulate the immune system. If you say, "I feel exhilarated, unbounded, and joyful," and I were to examine your blood, I would find high levels of interleukin and interferon, which are powerful anticancer drugs.