[mikeponders]

There is nothing wrong with taking a few seconds to answer something. As Sivers notes, sometimes not every question needs an answer, sometimes you need time and courage to just admit you don't know something concretely. If the other person is

- so impatient that they cannot wait some seconds for your answer

- not having a minimum attention span

- interrupting out of awkwardness or entitlement

you should rethink why you are allowing this.

I understand there are some situations and certain jobs that really require quick thinking (more like automatically recalling from their memory) under pressure and people are trained to behave in that manner, such as military and emergency services. Not every situation is like this and you cannot be possibly be prepared for every situation.

I remember something that my uncle (a doctor) said to me while telling me stories from his education and medical practice. "When you are unsure of something you should always ask/consult someone. It is wiser to admit you do not know something rather than give a wrong [and potentially lethal] answer."