One for sorrow, two for joy, three for a girl and four for a boy. Five for silver, six for gold and seven for a secret never to be told.
So I'm driving along and at 8:15 I see a solitary magpie (I'm in for a bad day, I think), then I drive a bit further on and at 8:30 I see a pair of magpies.
Now my question is this. Do the two magpies at 8:30 cancel out the lone magpie at 8:15? such that I should venture my entire life savings on the Euromillions this evening? Or do they, in fact, cumulate such that Mrs Attazder and I should start make preparations for the arrival of a female infant?
If the magpies accumulute, how long is the accumulation period. If I see another three on the way home, am I going to be winner at the 2016 Olympics? What if I see more tomorrow?