‘It is indeed an exacting requirement to have to ascribe physical reality to space in general, and especially to empty space.’ — Albert Einstein Most physicists work in a vacuum. That is, they tend to think in terms of particles in empty space. But both Albert Einstein and recent evidence say they are wrong: Far […]
Reader Stevo asks a deep question: ‘If space is granular and Planck size is the shortest “length” then what geometric “shape” is a single Planck “thingie”?’ Geometry studies size and shape. Last week we saw Bernhard Riemann in 1856 divining how to do geometry in either of two different kinds of space: continuous space and […]
A new understanding of the universe is wending its way into our world. What is it? Where does it come from? First let’s look at the old understanding. The Big Bang is the standard model of cosmology. It is based on general relativity and on evidence that space itself is expanding. It projects this picture […]
Heads up! A new technology is transforming gene editing. It gets my vote for top science news of last year. It will affect us all more than we can imagine. And the most surprising news may be its inventor. Many things can change the code of DNA. Chemicals, X-rays, ultraviolet, cosmic rays, and mistakes during […]
It’s a season for something personal, another kind of time travel, a different kind of history. Here is a guest blog authored by my father, Don, a short sketch of his long life so far (he skips over his M.Sc. and careers in science and management). It is based on an article he published in […]
Here is a mystery that needs help from armchair philosophers. Nowadays physics describes the world in terms of “fields”. What, then, is a field? It is weasel math that physicists invented to allow them to ignore the paradox of action at a distance. In the annals of thought the concept of action at a distance […]
Physics has an ongoing obsession with time. Some of the most important discoveries about time have been made with so-called thought experiments. Gedankenexperimenten, as Albert Einstein called them, have advantages. They need not be practical. They use no apparatus. Anyone can play. Many people have heard of the so-called twin paradox. It’s a Gedankenexperiment.You travel […]
The number of climate-driven natural disasters per year has more than doubled since the 1980s. Meanwhile average global temperature increased less than one degree. We know how to slow the increase. It’s a win-win. Slowing it will keep us safer and will save all of us lots of money. Step one is to understand the […]
Here’s some good news: A better battery may soon be on its way to a device near you. (There’s bad news too but it will have to wait.) Building better batteries is all about smaller, lighter, cheaper, faster charging, longer lasting . . . and most of all getting batteries to hold more charge. This key attribute […]