Japanese water-spirits who feed on cucumbers and blood and get up to all sorts of mischief but who are very knowing and can therefore prove helpful to...

The ratio of the change in the price of an OPTION to a 1 per cent change in the expected price...

Kappa (uppercase Κ, lowercase κ or ϰ) is the 10th letter of the Greek alphabet, used to represent the voiceless velar stop, or "k", sound in Ancient and Modern Greek. In the system of Greek numerals it has a value of 20. It was derived from...