Author Archive
Susskind’s 8th lecture on general relativity
Leonard Susskind continues reading his lecture course on general relativity in U. of Stanford. Previous lectures can be found here: Lectures 1-5, Lecture 6 and Lecture 7.
Susskind continues to discuss covariant derivatives, parallel transport of vectors, Ricci and Riemann tensors. In the second part of the lecture he turns to geodesics. He is terrific lecturer but after the lecture N7 I start wondering whether it’s worth spending so much time discussing technicalities 
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Workshop on tests of gravity at Case Western – day 1
Dear friends,
I am sorry for being rather quiet for a while. As many of you may already know, my laptop has decided to enter coma during the trip, as a result, I was left without appropriate internet access (sporadic use of Pascal Vaudrevange’s computer is not counted, thanks, Pascal!). Although the laptop tried to revive after we came back home, demonstrating some kind of “brain” activity, in a couple of days I understood that the growth of entropy is as inevitable as a finally victory of string theory over loop quantum gravity.
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One week to spend in US
At this very moment – when you are reading this – I am flying to US, where the final destination of my trip is Cleveland. The plan is to take part in the 3-day Workshop on tests of gravity and gravitational physics at Case Western Reserve U.
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On gun politics and culture in US
In Russia, any talk about personal weapons/gun policy gets immediately reduced to the question of how actually effective are guns for personal self-defence on the street. On the other hand, in US general attractor seems to be discussion of the statement that personal weapons is your defence against tyranny, i.e., “armed man=free man” etc. etc.
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Average life expectancy or more on data visualization
In continuation of my series of posts about data visualization (Dynamical maps and Gapminder), let me show you today another cool resource: interactive map of the world StatPlanet.
Here is for example a map showing average age in different countries (data from 2006):
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