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If matter is made almost entirely of empty space, why can’t my hand go through it? The answer is more mystifying than the question, and leads to some profound implications about our reality.

In the middle of this lab session, as literally hundreds of undergraduate students like me were racing against the clock, I was summoned to the side by one of the dozens of supervisors...

Millions worldwide watched in awe as the lunar module raced through space. People held their breaths at what was seen as the almost impossible mission. But many religious people felt disoriented...

In which I get a lesson in quantum mechanics from a rogue physicist trading in Kazakhstani warheads and high mathematics...

Question: I recently attended a class in Kabbalah and Chassidic Thought. The rabbi was talking about the "four elements"--earth, water, air and fire--as they are found in the human soul. I recognize this idea from ancient Greek and medieval philosophy, bu...

The physical realm as the "shadow" of the spiritual; the mitzvot as physical "symbols" that manipulate spiritual realities; matter as thye most compact form of energy; prayer as the language of the soul and the minyan as the "critical mass" that unleashes...

When a person enters a factory that functions without any human intervention, he is aware of a central mechanism that controls all the machines, keeping them synchronized. In fact, the very scarcity of the “human factor” testifies to the superlative quali...

By the Grace of G‑d 18th of Teveth, 5720 [January 18, 1960] Brooklyn, NY Greetings and Blessings: I received your letter of January 10th, in which you ask my explanation of the reference of the four basic elements (Yesodoth) mentioned in chapter one of th...