Monitor what they find.
There's a quack scientist in Japan who makes that claim that water does indeed remember (bordering on water even having sentience). In his "experiment," water exposed to the word "Hitler" went bad faster than other water. It should be no surprise to anyone that he won't reveal the gritty details of his experiments and no scientist anywhere has been able to replicate it.
In a more subtle version of "water having memory" is the basis of homeopathic ""medicine"". The claim here is that you can expose water to some curative substance and then keep watering down the water such that if there's any of the original curative substance is left, it's only a few molecules. But, that's OK! Because the water that was exposed to it remembers the curative substance and will itself be curative!!
Of course, water everywhere in the wild is exposed to deadly diseases, but they don't think about the bad things "water remembers."
So... keep an eye out that your 14 year old isn't led down that path on the Internet.