This morning I received an e-mail from an english friend where part of this e-mail is the extract showed below:

"...so your question relating to shot peening gave me a welcome opportunity to talk ad nausium on a subject I like. Thank you."

The part that says "ad nausium".. I do not know what that mean, but I suspect that can be understood as "to talk so much about a given subject until you yourself with nausea"...

I will await your comments.

Thanks.