Solution to: Always & Never

The answer is: a die (one of the dice). An explanation:

• "It's always 1 to 6": the numbers on the faces of the die;
• "it's always 15 to 20": the sum of the exposed faces when the die comes to rest after being thrown;
• "it's always 5": the number of exposed faces when the die is at rest;
• "but it's never 21": the sum of the exposed faces is never 21 when the die is at rest;
• "unless it's flying": the sum of all exposed faces when the die is flying is 21 (1 + 2 + 3 + 4 + 5 + 6).

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