Critical articles and essays - 3

• The Story of Euclid

Geometry was not born by itself; geometry is the brainchild of several thinkers that sublimated physical objects to abstracts models. Euclid is the epitome of all of them.

• The origins of the theory of the Hollow Earth

Our planet Earth being hollow was not a bizarre idea. Some people even believed in a hollow Sun. Historically, there were geological, theological, and astronomical arguments to support it.

• The curious infinite of Jorge Luis Borges

Our first intuitive idea of the infinite is what never ends. However, is that the only acceptable view? What about that which constant reshuffles itself?

• The vengeance of Galileo

Can science be abjured? Maybe Galileo used the power of the Church to catapult him into posterity. Maybe he let the Church write his last discourse for him!

• The subterranean world of Edmund Halley

The possibility of underground civilizations is still accepted today, mainly associated with alien beings. But a couple of centuries in the past, people were not thinking of aliens.

• The fourth dimension as seen from Flatland

The possibility of life in other dimensions is harder to imagine than life in other planets. Can there be life in two dimensions? Can there be life in four dimensions?

• Bernard Fontenelle's obsession with life on the Moon

While some people argued in favor or contrary to life in other planets, other were deeply interested in life on the Moon.

• About how A. T. Schofield found the fourth dimension in the Bible

A being from the fourth dimension can enter or leave our world at will without changing his form, or even being noticed. Are "celestial" beings from other dimensions?

• The strange extraterrestrial worlds of Camille Flammarion

Maybe one day we find a planet very similar to ours With atmosphere, trees, valleys and sunsets like here. Is this the hidden drive of our astronomers?

• The coordinates of the fourth dimension

The fourth dimension is an ambiguous concept; some people think of it as the "time dimension", mathematicians think of it as another plain vanilla dimension like the other three.