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Puzzle 613 


Imagine a bottle recycling skip, empty other than one lonely bottle.

Every hour, on the hour, people come and put bottles into the skip.

The first hour, at noon, one person came and put a bottle in.

One hour later, two people each placed a bottle into the skip.

An hour later, four people each placed a bottle into the skip.

This doubling of people continued until 11pm, when the skip was finally full.

When was the skip exactly half full?

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Puzzle 614 


What comes next in this sequence:

iron · bromine · uranium · argon · ?

Puzzle Copyright © Kevin Stone

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Puzzle 615 


Can you place a different 4-letter word into each of the brackets to create two longer words?
  drift[----]wind    home[----]bench    foot[----]mother   court[----]stick    moth[----]room quarter[----]ground   space[----]yard    wild[----]span    your[----]less    back[----]fighter
In the following example, the word 'book' creates the words 'cookbook' and 'bookcase'.
cook[book]case

Puzzle Copyright © Kevin Stone

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Puzzle 616 


What are the next three letters in this sequence:
HDD
TMRUTC
TCSO
TMRD

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