The daddy-longlegs has the world's most powerful venom, but fortunately its jaws (fangs) are so small that it can't bite you.
This statement is absolutely baseless. Three different unrelated groups are called "daddy-longlegs." Harvestmen have no venom of any kind. Same with crane flies. Pholcid spiders have venom (like almost all spiders) but there's nothing special about it; in fact, a recent study showed that pholcid venom is unusually weak in its effect on insects.