The Problem. When Galileo died in 1642, there were still two competing schools of free fall. The Galilean School upheld Galileo’s law of free fall, which may be posed either…
Could You Have Defended Galileo?
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An Enormous Test of Bell’s Inequalities
Nicolas Gisin (and colleagues) have executed an enormous test of the Bell-inequalities! Their experiment will span laboratories in the cities of Geneva, Satigny, and Jussy. I believe that makes it…
Visualize a Black Hole at the Event Horizon
This cute little animation shows the causal structure around a classical black hole in an interesting way. The perspective is that of a body orbiting just outside the event horizon:…
When is the Prime Age of Discovery in Physics?
Remember that old adage about young scientists? It goes something like this: most scientists do there best work before they’re 25. I don’t know where this folk truism comes from,…
Solving the Black Hole Information "Paradox"
In January, Abhay Ashtekar posted a short preprint in which he (along with two collaborators) proposed a new solution to the so-called black hole information paradox in 1+1 dimensions. Their…