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,

My 19-year-old son has Asperger’s syndrome and is incapable of lying. He tends to see the world in absolutes and struggles with white lies. We have urged him to sometimes compliment people to spare their feelings, but he thinks it’s important to be brutally honest. He says, “What if you praise somebody’s ugly drawing and they then try a career as an artist? Why tell somebody that their new haircut looks great when you could warn them that they will be teased about it?” Have you looked into the ways that dishonesty may be different for those on the autism spectrum?

—Bill 

I wrote a book about dishonesty and lecture frequently about it. Over the years, many parents have come to me after a talk to tell me about children who just can’t lie—and the children usually turn out to have some form of autism. Recently, I brought this up with Murali Doraiswamy, a professor of psychiatry and behavioral sciences at Duke University, who confirmed that many children on the autism spectrum do indeed have a hard time being untruthful.

This is caused, he added, by the trouble they have with what specialists in the field call “theory of mind”—that is, the basic ability to put ourselves in somebody else’s shoes and empathize with their perspective. Most of us are able to ask ourselves, “How would that person feel if I told them that their haircut is unflattering or that they smell?” Many young people with Asperger’s don’t tend to think this way, so they often don’t develop the habit of telling white lies for reasons of politeness. They don’t learn to dial down unnecessarily hurtful truths to spare another person’s feelings.

My view is that social politeness often acts as training wheels for more serious lying, so children who don’t understand white lies often don’t develop the ability to lie on a larger scale—which may not be such a bad thing. Maybe we should try a president who has Asperger’s?

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Dear Dan,

If human beings were tools, which tools would we be?

—Kelly 

The best analogy for describing human nature is a Swiss Army knife.

First, it is useful for many different tasks. Second, the Swiss Army knife gives us a lot of tools, but none of them (no offense to the Swiss) are that great. The knife is small; the screwdriver is hard to use; the can opener is OK but time-consuming to operate. And third, everything we do with a Swiss Army knife takes some time—we have to figure out which tool we want, find it, dig our nails into its little notch and yank out the desired tool.

Together, these features echo human nature: We aren’t really ideal for anything and can be a bit slow to get going, but we can do a decent job on many different challenges.

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Dear Dan,

What is the most important attribute to look for in a long-term romantic partner?

—Ed 

Low expectations. Much of our happiness depends on relativity—on comparing what we have with what we expected to have. In long-term relationships, we’re bound to be disappointed at some point. But if we adjusted our expectations, we might be pleasantly surprised from time to time.

See the original article in the Wall Street Journal here.