The highest road is the sky, a road for birds. The middle road is a bridge, a road for people and the 3rd is the river under the bridge, a road for fish.
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OK try this 😉
The number of lilies in a pond double every day. So, on the first day of the month there is one lily. On the second day, two lilies. Then the next day four lilies, then eight, sixteen, thirty two, etc. If the pond is full on the 30th day of the month, what day is it half full?