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Spring Cleaning Day
Spring Cleaning Day
Spring has arrived and Julia has the cleaning bug. The day was so warm and sunny she just couldn’t help herself. It was spring-cleaning time! She dusted and washed, moved furniture, shook out rugs, scrubbed windows, and waxed woodwork. She got into a routine where she would clean two rooms, then take a break, then she’d clean two more rooms, and then take a break, until she was done (the start times were every two hours from 9:00AM to 7:00PM). By the end of the day, she was exhausted…but the house sparkled with cleanliness!..
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Bisection
Bisection
This kind of dissection is a little bit special. Except the fact it is bisection, its additional rule is to produce mirror pieces, and on top of that mutually rotated at 90 degrees. Can you stick to these strict rules while solving? By Zsuzsa Károlyi.
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The 8 Angles
The 8 Angles
Eight pairs of identical moons are orbiting a green planet. The goal is to connect them all to the planet with a link per moon. It's a harder sequel to The 4 Angles puzzle by the same author.
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What Life Has to Offer...
What Life Has to Offer...
Last month's quote was from Eleanor Roosevelt, this month we have a quote from Theodore Roosevelt. Our past president has a bit of wisdom to share, regarding the best things that life has to offer us.
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Toy Strip Origami
Toy Strip Origami
Three colored strips have to be folded into three colored letters. The key idea is to keep the number of the performed folds as low as possible. Is it a challenge that would be TOY to you?
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The T Puzzle
The T Puzzle
There are two capital T letters that can be arranged from this set of four pieces. Form them first and then try a bonus shape - a kind of isosceles trapezium.
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Olympic Ice Dancing
Olympic Ice Dancing
Sally always looks forward to the Olympic ice dancing trials. This year, the competition was fierce and there were many outstanding ice dancing couples. The free style routines, which allowed the ice dancers to make up their routines without any specific performance requirements, could be no longer than 3 minutes. As it happened, each of Sally’s favorite teams used one style of music, each different from the others, for their freestyle routine, instead of the more common compilation of musical styles.
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Grocery Shopping
Grocery Shopping
Even though she forgot her shopping list, Harriet spent the morning grocery shopping for her family. Being the forgetful sort, forgetting her list was not that unusual, just a bit inconvenient. Although she didn't usually have too much trouble with the grocery shopping because her four kids accompanied her and were used to reminding her when she forgot something...
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The Two Queen Question
The Two Queen Question
A minimax problem: find the maximum and the minimum number of attacked vacant cells of a standard chessboard when there are only two chess queens on it.
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Coins & Triangles
Coins & Triangles
Remove some coins from a big coin triangle containing ten coins and a lot of smaller equilateral triangles so that no equilateral coin triangles remain.
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The Bat
The Bat
Make the match bat flying away in another direction. What do you think, how many moves will you need to do this? Just three right moves...
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Yard Sale
Yard Sale
Saturday was a big day for yard sales – the weather was gorgeous and people from all around town had yard sale signs out before their homes. Many were tempted to stop and many items found new homes that day. Five people in particular were very pleased with their purchases as each got a piece of furniture in good shape and at a very good price...
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