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Puzzle 489
Below is a very special grid, around each shaded number are 8 white squares.
However, each white square should have a number from 1 to 7.
Once filled in, these 8 numbers will sum to the shaded number.
In addition, once completed correctly, no row nor column will contain a duplicate number within a white square.
For example, the top row may be 5 6 4 2 3 1 7, etc.
This is a very difficult puzzle, and many people resort to using a computer to help them, which is a challenge in itself.
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Puzzle 490
What comes next in this sequence:
hydrogen · helium · lithium · beryllium · boron · ?
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Puzzle 491
Here is a well known proverb with the consonants removed. What is the proverb?
A --i--- i- -i-e -a-e- -i-e.