Sometimes people lie just to inflate their image—some think this motivation is the reason behind President Donald Trump's demonstrably false statement that his Inauguration crowd was bigger than President Barack Obama's first one. But people also lie to cover up bad behavior, as American swimmer Ryan Lochte did during the 2016 Summer Olympics by claiming to have been robbed at gunpoint at a gas station when, in fact, he and his teammates, drunk after a party, had been confronted by armed security guards after damaging property.

We can find similar examples even in fields that are dedicated to the search for eternal truth. And one doesn't have to look far, either. Take the physicist Jan Hendrik Schön, for example, whose purported breakthroughs in molecular semiconductor research proved to be fraudulent.

Lying is something many of us are very good at. We do it while interacting with strangers, co-workers, friends, and loved ones. Turns out, our capacity for dishonesty is as fundamental to us as our need to trust others, which ironically makes us terrible at detecting lies. Being deceitful is woven into us, so much so that it would be truthful to say that to lie is human.

The ubiquity of lying was first documented systematically two decades ago by Bella DePaulo, a social psychologist at the University of California, Santa Barbara. DePaulo and her colleagues asked 147 adults to jot down for a week every instance they tried to mislead someone. The researchers discovered that the subjects lied on average one or two times a day. Most of these untruths were innocuous, intended to hide one's inadequacies or to protect the feelings of others. Some lies were excuses (one subject blamed the failure to take out the garbage on not knowing where it needed to go). Yet other lies, such as a claim of being a diplomat's son, were aimed at presenting a false image. While these were minor transgressions, a later study by DePaulo and other colleagues involving a similar sample indicated that most people have, at some point, told one or more "serious lies", like hiding an affair from a spouse, or making false claims on a college application.

Researchers suggest that lying as a behavior arose pretty soon after the emergence of language. The ability to manipulate others without using physical force likely conferred an advantage in the competition for resources and mates, akin to the evolution of deceptive strategies in the animal kingdom, such as camouflage.

"Lying is so easy compared to other ways of gaining power," Sissela Bok, an ethicist at Harvard University who's one of the most prominent thinkers on the subject, told Nat Geo. "It's much easier to lie in order to get somebody's money or wealth than to hit them over the head or rob a bank.

"Experts are learning that we're prone to believe some lies even when they're easily contradicted by clear evidence. These insights suggest that our proclivity for deceiving others, and our vulnerability to being deceived, are especially consequential in the age of social media.

So in the case of r/ThatHappened, it's nice to see that we can still retain our ability to distinguish truth from fiction.