It is my firm conviction that the secrets of the natural world are revealed not by blind adherence to ancient texts, but through direct...

Through my perspicillum, God has revealed a marvel: a celestial clockwork of unparalleled precision orbiting the great planet Jupiter. I have named these four...

For too long, men have been content to learn of the world by reading ancient texts, as if Truth were a thing to be...

For too long, we have been told the heavens are perfect and unchanging. This is a falsehood! The Sun itself, that glorious lamp, has...

I have spent my life staring at the heavens, not with the eyes of faith or poetry alone, but with lenses I ground myself....

For too long, men have relied on dusty texts and superstition to mark time. I say, look for yourself! The heavens provide a magnificent...

For too long, men have sought knowledge only in dusty books and the pronouncements of ancient masters. But I say to you, the great...

I have long held that the book of nature is written in the language of mathematics. Many look upon a great tower or cliff...

For centuries, the learned have blindly accepted the word of Aristotle that heavier bodies fall faster than lighter ones. I say we must not...

I present to you a most versatile instrument, born of my own studies in Padua. It is a calculating device I call the sector,...

Many builders work by custom alone, placing beams as their fathers did without understanding the 'why' of their art. But Nature herself is a...

I present here a guide to fashioning a simple lens, the very heart of the telescope with which I first witnessed the moons of...

The senses can deceive, but an instrument of reason reveals truths hidden in plain sight. I have used such a device to gaze upon...

By careful observation of a swinging lamp in the great cathedral of Pisa, I was struck by a profound truth: the regular and constant...