These were the Nip Impressions columns in May 2014 (sponsor in parenthesis):
I don't think like you do (Process Labs)
Energy is always the question; the problem is discerning the answer (Philadelphia Mixing)
A real advantage for paper (Bright Technologies)
What about ink? (Conmark)
Warning! These files are fairly large (size in parentheses), so you'll want to do this on a high speed connection.
Enjoy audio? Listen to Pulp & Paper Radio International here.