Where knowledge fails, controversies flare. Well-chosen controversies focus, educate, and encourage further research. Sixteen years of controversies in neurology did not dampen the interest in such a section in the Archives of Neurology and may have inspired several clinical trials.1
As an advancing field, stroke has its own growing share of controversies. One of the most hotly contested is the use of thrombolysis in acute stroke. In this issue, Geoffrey Donnan and Stephen Davis inaugurate the first of what will be a regular “Controversies in Stroke” section. We welcome them as editors and encourage you to make suggestions for topics or volunteer to participate in a controversy.
While controversies can generate heat as well as light, passion is preferable to indifference, if it fuels constructive means to a worthwhile end.