From Today's RBC Daily:

We all work hard to prepare our candidates for the interview process. So what are the toughest companies to interview for? Glassdoor recently compiled list of the top 25 companies that ask the most difficult interview questions. McKinsey leads the list for asking the most notoriously difficult questions. CNN/Money serves up the complete list and a good overview of the process with tips to best prepare your candidates: http://cnnmon.ie/OUPK97

Question of the day: What is the most difficult interview question you routinely ask?