Despite hopes to the contrary, it now appears more certain than ever that most of the universe is made from some kind of unworldly "dark matter" that can pass right through ordinary matter, leaving barely a trace.
I was puzzled by one statement in "Dark Matters: A Cosmic Hall of Mirrors" (Week in Review, March 5): "Despite hopes to the contrary, it now appears more certain than ever that most of the universe is made from some kind of unworldly 'dark matter' that can pass right through ordinary matter".
Not so with neutrinos: Since they hardly interact with matter, they can pass by undeterred.
The young Argentine was schooled in the academy of La Masía, where Barça imbues boys with the notion that, no matter their size, they can pass and move the ball and their bodies faster than opponents can think.
What matters is whether firms can pass on costs to consumers, and whether they have access to less-carbon-intensive technologies.
To make matters worse, only one car can pass through the narrow one-way street where his seven-floor building stands, and Mr. Mahamudur often has to calm impatient drivers blocked by delivery vans.
A neutrino is an elementary particle that travels at nearly the speed of light and can pass through ordinary matter almost undisturbed.
