Pensatempos

Orlando Figueiredo


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Fake news…

…and other silly books.

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Good old days…

It actually seems good old days are coming back!


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Sexual selection | Orlando’s blog

From another blog of mine.

https://orlandofigueiredo.blog/2017/02/12/sexual-selection/

One of the best-known species with evident and exuberant speciation traits is the peafowl. The male peafowl (also known as peacock) has a huge and odd fatherly tail, vivid cobalt blue feathers covering part of its back and its chest and neck to the head, and vivid orange feathers on the tips of the wings. All this exuberance and exhibitionism turn the peacock into an easy target to predators. On the other hand, the peafowl female (the peahen) has a short and discrete tail, its body covered by feathers of an uninteresting greyish. They easily go unnoticed in their natural habitat and seem to deal quite well with that.

America first

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American Psycho: this week’s cover of German magazine @DerSPIEGEL #AmericaFirst


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The Bright Side of the Moon

From orlandofigueiredo.blog: the blog of a physics and science teacher.

Orlando's blog

maxresdefault Bright side (on the left) and dark side (on the right) of the moon.

Most people are, I assume, aware that we always see the same side of the moon. This happens because the moon rotational period is equal to the moon translational period, i.e., the time the moon takes to a complete turn around its axis equals the time the moon takes to make a complete turn around the earth. In consequence, the moon as always, the same side facing earth. This is not by chance, and physics can explain it. In fact, the reason is gravity. As the moon warps the earth shape by means of the tides, so does earth to the moon warp the moon rocks towards us. The protuberance caused by earth gravity slowed down the moon’s rotation to the point of leaving the lunar ‘rocky tide’ permanently facing us.

This happened 4 billion (4∙10

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Freedom: the irony of the fallacy 

A gentle reminder: The niqab is the cloth that covers the face, but not the eyes, of women who use it. Women wear it along with the hijab which is used to cover the head. Both are part of the Muslim religious garment.


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Galileo and the Falling Bodies

From another blog of mine.

Orlando's blog

Aristotle (384 BCE – 322 BCE) said heavier bodies fall faster than lighter ones, and so does common sense. But in fact, the speed of a falling body increases by the same rate independently of its mass or weight. It was needed a mind like the one from Galileo Galilei (1564 – 1642) to unveil it, and it was a bitter pill to swallow for some of the powerful of his time.

Galileo was able to understand that, without the resistive forces of air, the rate at which the falling speed of a body increases is independent of its mass or weight. Although the phenomenon has been observed several times on earth under vacuum conditions, in August 1971, astronaut David Scott (pictured in the video bellow), the commander of the Apollo 15 mission, took with him to the moon a feather and a hammer. At the end of the last…

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