> you should (almost) never claim 100% certainty in anything Sort of off-topic but this is especially good advice when giving testimony. I gave deposition in a

> you should (almost) never claim 100% certainty in anything Sort of off-topic but this is especially good advice when giving testimony. I gave deposition in a patent case once and, as I remember it, I was specifically instructed to qualify every answer with a statement of how certain I was. You can get in all kinds of trouble if you say "X is Y" and it turns out that X is actually Z. But if you say "I believe X is Y," well, no one can argue with that!