Over-the-counter painkillers can cut risk of Parkinson's by 60%?

Non-steroidal anti-inflammatory drugs, more specifically.

The study volunteers were considered regular users of painkillers if they took two or more pills a week for at least one month.
The link was still in evidence up to two years after the person stopped regularly taking the drugs. The effect did not increase if the person took more than two doses a week and the drugs had no effect if the disease was already well developed.