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Leap Years and Leap Seconds


Earth takes close to 365.25 days to complete a revolution around the sun. So to align the calendar with the astronomical value, every now and then we do an adjustment. If a year is exactly divisible by 4, but not by 100 unless it's also exactly divisible by 400, then we add February 29th. But when do we add a leap second?
See Also: http://en.wikipedia.org/wiki/Leap_second

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<< Previous Puzzle Sunday, February 27, 2011 Newer Puzzle >>

Humble Busy Bumble Bee

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Bumblebees would make an excellent job of finding the lowest score for tRace Perfect puzzles. It turns out they learn to fly the shortest possible route between flowers even if they discover the flowers in a different order.
See Also: http://www.qmul.ac.uk/media/news/items/se/38864.html

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<< Previous Puzzle Saturday, February 26, 2011 Newer Puzzle >>

The Letter H

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In egyptian hieroglyphics, the letter H was represented by a fence or wall symbol. The letter H has a semitic background, and in my natural language, Maltese, a wall is still called a 'hajt' (hait).
See Also: http://en.wikipedia.org/wiki/H

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<< Previous Puzzle Friday, February 25, 2011 Newer Puzzle >>

Alphabet

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The word alphabet is made up of 'alpha' and 'beta', the first two letters from the greek alphabet, which eventually became 'a' and 'b'.
See Also: http://en.wikipedia.org/wiki/Alphabet

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<< Previous Puzzle Thursday, February 24, 2011 Newer Puzzle >>

Suspended Sentence

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What does it mean when a judge hands a suspended sentence to a defendant? A "suspended sentence" is a
See Also: http://en.wiktionary.org/wiki/suspended

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<< Previous Puzzle Wednesday, February 23, 2011 Newer Puzzle >>

Pisces

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Pisces is a constellation. The word pisces is latin for fish (plural). Funnily enough it borders the Aquarius constellation. Aquarius means "water holder". So these are fish just out of water :)
See Also: http://en.wikipedia.org/wiki/Pisces_%28constellation%29

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<< Previous Puzzle Tuesday, February 22, 2011 Newer Puzzle >>

Pyramid

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The greatest of the pyramids is the Pyramid of Khufu in Giza, Egypt. It is the only one of the 7 wonders of the ancient world that still exists. It has a volume of 2.5 million cubic metres. You could stack around 17,000 school buses inside it, except it is mostly solid!
See Also: http://en.wikipedia.org/wiki/Great_Pyramid_of_Giza

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<< Previous Puzzle Monday, February 21, 2011 Newer Puzzle >>

Sim Pencil Game

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Sim is a 2 player game played on paper starting with 6 dots in a hexagon shape. Players take it in turn to draw a line between two dots using their own color. When a player draws a triangle in his color, she loses. Green's turn in this green vs blue game setup and they must give up. As for this puzzle. it's simpler than it looks because you can only move between the hexagon's outline.
See Also: http://en.wikipedia.org/wiki/Sim_(pencil_game)

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<< Previous Puzzle Sunday, February 20, 2011 Newer Puzzle >>

Presumptuous Cat

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Cats will keep pushing you until they get what they want. Their confidence has no limit. You don't own them. They own you!

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<< Previous Puzzle Saturday, February 19, 2011 Newer Puzzle >>

De Revolutionibus Orbium Coelestium

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Today is Copernicus' 538th birthday. On his death bed he published 'On Revolutions of the Celestial Spheres'. The first biggest push towards heliocentrism i.e. planets revolving around the sun. The puzzle today spells the roman numerals for 112, the atomic number of the element Copernicum (Cn) named after Nicolaus Copernicus.
See Also: http://en.wikipedia.org/wiki/Nicolaus_Copernicus

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<< Previous Puzzle Friday, February 18, 2011 Newer Puzzle >>

This sentence is a lie!

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Is the title of this puzzle a lie or a truth? This is called the "liar paradox".
See Also: http://en.wikipedia.org/wiki/Liar_paradox

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<< Previous Puzzle Thursday, February 17, 2011 Newer Puzzle >>

Flying a kite

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is so much fun! You should try it at least once in your adult life too! This puzzle, on the other hand, might need a little more thinking than flying a kite to achieve the lowest score of 363. But all you need to do is keep trying and optimising your route.
See Also: http://www.wikihow.com/Fly-a-Kite

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<< Previous Puzzle Wednesday, February 16, 2011 Newer Puzzle >>

Edward De Bono - L Game

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My dad brought this puzzle home when I was a kid. It consists of an L piece for each of two players, and two neutral pieces. Players take it in turns to move their piece on a 4x4 board, until one of them is blocked. The tRacePerfect logo is partly inspired by this puzzle.
See Also: http://www.edwdebono.com/debono/lgame.htm

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<< Previous Puzzle Tuesday, February 15, 2011 Newer Puzzle >>

Galileo Galilei

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He built a telescope. He was the first to observe Jupiter's moons and noted that they revolved around Jupiter. He was persecuted by the church that still believed everything revolved around the Earth. He is a pillar of Science. Happy 447th birthday Galileo!
See Also: http://en.wikipedia.org/wiki/Galileo_Galilei

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<< Previous Puzzle Monday, February 14, 2011 Newer Puzzle >>

On Valentine's Day

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and on every other day, I love you. May Greek Eros or Roman Cupid be kind to you too on this day.
See Also: http://en.wikipedia.org/wiki/Eros

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<< Previous Puzzle Sunday, February 13, 2011 Newer Puzzle >>

Two Cubed Equals Eight

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2 to the power of 3, also known as two cubed, equals 8. A cube has 8 faces. Also note how the outline of a cube from this angle is a hexagon.
See Also: http://en.wikipedia.org/wiki/Cube

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<< Previous Puzzle Saturday, February 12, 2011 Newer Puzzle >>

Oll Korrect...

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or is it? There is plenty of discussion about the true origin of OK, or O.K., or Okay. We use this term so often, yet we are not sure about its curious origins!
See Also: http://en.wikipedia.org/wiki/Okay

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<< Previous Puzzle Friday, February 11, 2011 Newer Puzzle >>

Yawn

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Yawning's purpose is to increase oxygen intake and stretching the ear drums. The emoticon symbol for a big yawn is |-O . But why is yawning so contagious, even between some animals? The puzzle is meant to look like a monkey ear :)
See Also: http://en.wikipedia.org/wiki/Yawn#Contagiousness

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<< Previous Puzzle Thursday, February 10, 2011 Newer Puzzle >>

Deep Blue Beats Kasparov

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On the 10th February 1996, IBM computer 'Deep Blue' beat chess champion Garry Kasparov for the first time! And, the rook can castle with the king.
See Also: http://en.wikipedia.org/wiki/Castling

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<< Previous Puzzle Wednesday, February 9, 2011 Newer Puzzle >>

Fly Paper Plane Fly!

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A team has dropped 100 paper planes from (almost) space to see how they disperse. And people have picked them up from all across the world!
See Also: http://projectspaceplanes.com/

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<< Previous Puzzle Tuesday, February 8, 2011 Newer Puzzle >>

Box Perspective

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Perspective is a funny thing. What's the quickest way to visit the two marked opposite corners of this box?
See Also: http://en.wikipedia.org/wiki/Perspective_%28graphical%29

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<< Previous Puzzle Monday, February 7, 2011 Newer Puzzle >>

Eulerian Cycle

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If every corner has an even number of connected lines, then you can finish the puzzle without having to repeat any of the lines, and also ending where you started, hence a cycle, a Eulerian Cycle.
See Also: http://en.wikipedia.org/wiki/Eulerian_path

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<< Previous Puzzle Sunday, February 6, 2011 Newer Puzzle >>

Counting Sheep

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Can't sleep? Count sheep! But why? "The idea, presumably, is to induce boredom while occupying the mind with something simple, repetitive, and rhythmic." Baaaa! Zzz...
See Also: http://en.wikipedia.org/wiki/Counting_sheep

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<< Previous Puzzle Saturday, February 5, 2011 Newer Puzzle >>

Seasonally Adjusted

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Seasonal adjustment is when salt, pepper and other spices are added to food during the cooking process to adjust the flavour of the food. Or is it not?
See Also: http://en.wikipedia.org/wiki/Seasonal_adjustment

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<< Previous Puzzle Friday, February 4, 2011 Newer Puzzle >>

A Launch

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'Launch' can refer to a large motor boat. Today I publicly launch this website by promoting it with my family and friends. Bon voyage!
See Also: http://en.wikipedia.org/wiki/Launch_%28boat%29

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<< Previous Puzzle Thursday, February 3, 2011 Newer Puzzle >>

Red Envelope

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Kung Hei Fat Choi! Happy Chinese New Year! It is a custom to give monetary gifts in red envelopes. And it is the year of the rabbit.
See Also: http://en.wikipedia.org/wiki/Chinese_New_Year

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<< Previous Puzzle Wednesday, February 2, 2011 Newer Puzzle >>

Eating Caterpillars

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What do you get when you eat caterpillars?
Butterflies in the stomach!
just like before an important event, like launching your new website
See Also: http://en.wikipedia.org/wiki/Butterflies_in_the_stomach

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<< Previous Puzzle Tuesday, February 1, 2011 Newer Puzzle >>

Pythagoras

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(15x15) + (20x20) = 25x25; The combined area of the two smaller squares equals the area of the biggest square.
See Also: http://en.wikipedia.org/wiki/Pythagoras

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