lechat said:
So what is the one piece of knowledge so obscure and so useless that there is basically no way you will ever need to know it and no likelihood that you would ever meet someone who needed to know it?
For me the most useless fact i can bestow upon the masses is this:
Cockroaches are incredibly drawn to the smell of urine and banana peels so much so that if you ever need to attract a large amount of roaches to a spot there is more than likely no better bait.
If you take the DNA structure of a lemon and create a mirror image of it, you get the DNA structure of an orange.
The name of the unit of measurement for shoe sizes in the UK is called a barleycorn.
Sewer rats will sleep in great piles in their nests and often become covered in their own waste and the trash around them, getting permanently stuck together into something which is then called a "rat king." The same thing can happen to baby squirrels if they are raised in a sappy tree, getting stuck together into a "squirrel king" and then dying because they can't forage and do squirrel stuff.
Cows are so dumb they will not dig under even a small layer of snow to find the grass beneath like horses will, which means they have to be fed hay or corn when it snows.
If you blindfold a person and put them in a large empty field and tell them to walk in a straight line, on average they end up walking into a sort of spiral shape. It's unknown why this happens, but it's thought that perhaps this is a survival mechanism to lead a person not too far from where they started so they don't get lost.
The Renaissance artist Donatello had a nickname: gattamelata, which means honey-cat. It is unknown why he was called this.
There is a region in England known as the "rhubarb triangle" which is comprised of three towns where 90% of the world's winter rhubarb is grown. They "force grow" it, which means they leave it out in the sun for a long time, and then take it into a completely dark room which forces the plant to expend all of its energy very quickly and produce a lot of rhubarb really quickly. It grows so fast you can literally hear the plants creaking as they grow.
Napoleon was not actually short, he was actually a bit above average height for his time. However, the French inch was slightly larger than the English inch at the time, which led to a misunderstanding about his height which may or may not have been deliberate.
If several women live together in close quarters for a long period of time, their menstrual cycles will often synchronize.
These useless facts and more can be found on the amazing and hilarious BBC show hosted by Stephen Fry, QI: