Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I consider myself a steadfast atheist, but I have an irrational dilemma: Every time I want to throw away things that I no longer need, I find myself unable to chuck out anything that belonged to my parents. I can’t even part with their old pictures, which I have digitized and stored permanently on my hard drive. Am I being ridiculously superstitious?

—Eve

Religious belief and superstition aren’t really the same thing. Paul Rozin of the University of Pennsylvania has done excellent research showing that we are all superstitious, to some extent. In one of his experiments, participants were asked to throw darts at a target and were rewarded the closer they got to its center. Sometimes the center was the image of a beloved figure like President John Kennedy; sometimes it was someone widely despised, like Saddam Hussein.

People hit the bull’s-eye more for Saddam and missed more for JFK. They knew, of course, that pictures aren’t the same as people, but they still attached some of the person’s symbolic meaning to the images, which made it harder to harm them.

This type of emotional link means that when you think about throwing out your parents’ belongings, you feel as if you are discarding a part of them. My advice? Send the items that you don’t want but can’t destroy to your siblings or other relatives and let them deal with them.

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Dear Dan,

I’m renting an apartment with two friends. One of them is moving in on August 24. I plan to move in on August 29, and the third friend is planning to join us in early September. Our landlord will charge extra rent for those days in August. Who should pay?

—Randy 

The right way to split the cost depends on the timing and sequencing. If the lease was always set to start on August 24, then you should all split the cost because you all undertook the responsibility of starting the contract together. But if the contract could have started on any day, and your first friend pushed you into starting it on August 24, that friend should be on the hook for funding the extension. Fairness mandates considering the process here, not just the final outcome.

That said, remember that you’re all going to be roommates, perhaps for a long time, and starting your joint life together by protracted haggling may open the door to years of annoying accounting discussions (“You had an extra swig of the milk, so you owe me 75 cents”) rather than years of deep friendship. With this in mind, I suggest dividing the rent equally—but also asking the people moving in early to do more to set up the apartment, call the cable company, get basic supplies and figure out where the furniture goes. That way, they will contribute more to the overall endeavor but in a way that is compatible with long-term friendship.

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Dear Dan,

We have lots of meetings at my office, and when I speak up, I often worry that as a rather junior female employee, I don’t sound as if I have enough authority. Any advice about how to seem more commanding?

—Katherine 

One of the best ways to increase your perceived authority is to start using acronyms. My favorites are WAG (Wild-Ass Guess) and SWAG (Scientific Wild-Ass Guess). My SWAG is that deploying a few well-placed acronyms the next time you make a point will give your gravitas quotient (or GQ) a boost.

See the original article in the Wall Street Journal here.