I started a hive in June this year with foundation. However, after some reading I cut out most of the foundation on the combs that hadn't been built up yet. I'd estimate that I have about 50% foundation, and 50% natural.

Yesterday I noticed a huge disparity in the size of my worker bees. some were about 30% bigger then the others. Is this really just the difference caused by the cell sizes? I assume so, but it just seems hard to believe.