> Any argument that starts with "I don't think it can be done" is a losing argument. But plenty of interesting opinions start that way -- interesting because s

> Any argument that starts with "I don't think it can be done" is a losing argument. But plenty of interesting opinions start that way -- interesting because someone with expertise thinks so, and/or because the opinion is followed by well-reasoned arguments. OTOH, "it can't be done" is often based on current assumptions about hard limits. Those assumptions have been broken routinely and consistently for hundreds of years now.