There are deep sea fish which concentrate gold from sea water. When they die, they sink rapidly to the sea bed, which in places contains a higher proportion of gold than the richest gold mines on land. However, the difficulty of accessing the deep sea bed makes it uneconomical to harvest.
Origami derives from a method of making lightweight arrow heads by folding the leaves of a species of gingko tree to produce razor-sharp cutting edges.
The natural smell of leather has a tendency to scare domestic animals. To avoid this, an essential part of the manufacturing process is to stack the animal skins in layers alternating with layers of horse dung, roll them up, and store them in barrels for six months. What we think of as the smell of leather is actually the result of this process.
The 'frisbee' quality of biscuits is determined by the nature of the top surface. In scientific tests, smooth-topped Rich Tea scored the longest distance, and Lincoln showed the greatest lift, due to the vortices created by the regular pattern of knobbles on the top. Maryland Cookies will not fly.
The three-toed sloth actually has four toes, one on each foot, but as they fall off regularly and are regrown, the typical sloth only has three toes at any one time.
The Coriolis Force is the reason why more left-handed people, per head of population, are found in the southern hemisphere than in the northern. (Darren: Sorry, your entry is now null and void - points will be deducted. Depending on how you read it, your statement is correct).
There are always seven Wonders of the World. If one is destroyed, an unranked Wonder ascends to the Seven. However, knowledge of which are the Seven Wonders was lost in the 16th century.
There will never be thirteen British monarchs with the same name, since it would unleash a constitutional crisis as to whether the last should be designated XIII or XIIb.