• Catenary: the gravity-dependent curve
Catenaries cannot be imagined without the existence of gravity (should I say space-deformations?). Architects are well-related with them for their usefulness in bridge construction.• Countable and uncountable sets
We think of countable sets as those with a finite quantity of elements. However, some infinite sets are also countable. Is this a paradox?• The many faces of the parabola
Parabolas are elegant geometric figures. We can find them in car light, flashlights, parabolic antennas.• The unbelievable and amazing Moon
Why does the Moon has so many craters? Because the Moon is a shield for the life in our planet. But in addition to this fact the Moon carries with it a rare coincidence.• A counter-intuitive infinite expression
How hard is it to accept that 0.999... = 1? There are many ways to shows that this equality is true.
Credit cards are sized with secret dimensions. Take one in your hands and see the similarity with the golden rectangle, or with the proportions of the Greek Parthenon.• The unimaginable $0.99 price
Tagging articles and goods with a $0.99 price is very common. But if you toss the 99 coins into the air, what is the probability that all of them fall same side up?• The myth of zeros and ones in computers
People think of computers as storing information with zeros and ones (0 and 1). Nowhere in any computer are zeros or ones stored. • Every number is infinitely small
Having hard times trying to figure out the largest number? Then try to figure out the smallest fraction.• Colorful one-one (1-1) mappings
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A mathematical transformation is taking a curve or surface and submit it to deformations. Curious figures arise when colors are involved.