us. job security, 22% of american workers surveyed say they are not taking vacations because they don't want someone to think they're replaceable. is that something that should be a concern? >> well, whether it should be or shouldn'ter really doesn't matter. it's a concern for these people because they're afraid. they're afraid about out of sight, out of mind. if i'm away from the workplace and the work gets done, maybe i'm expendable. there are surveys that show that some managers are less likely to promote employees that take all of their vacation plan. and a study said that people who don't take all of their vacation time earn more than those who did. >> there are different with different cultures, some marks say you have to take your vacation, and there's research that shows that, depending on the job. if you work in a creative kind of job, getting a break and getting away for a week or two, and returning, i do a lot of writing in my work, and i get writer's block sometimes, and if i go to the grocery store or jim, all of a sudden, things pop in my mind because i psychologically take a break. so i don't want to say all organizations are pro or anti-vacation, but others have a macho cu