Think you can lie to a five-year-old? Think again!

Not so fast: Grown ups who think they can pull the wool over kids' eyes may have to work on their skills a bit more in order to convince them.

Even though kindergarteners have a reputation for being gullible, they are actually pretty good at evaluating sources of information.

Kids learn to discern tomfoolery early on, according to a new study published in PLOS One, that finds that even though they might still have a lot to learn, they are able to judge the quality of what’s being taught to them.