Tuesday, December 25, 2007

Induced age distribution

Consider a stable population where the mortality rate is uniform with respect to age. Essentially there is one birth per year and one death per year, randomly selected from the population. What is the age distribution pyramid? What is the variance of age of the nth oldest member of the population?

This is a data backup strategy, where we keep some number of old copies, randomly deleting one to make room for the latest one.

Monday, December 24, 2007

il

mild wild child

build guild

gild

wilt quilt stilt tilt guilt gilt built hilt silt kilt

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Sunday, December 23, 2007

Around the USA

Boston, Providence, Miami, New Orleans, San Diego, Seattle, Boston.

providence, ri to: miami, fl to: st petersburg, fl to: apalachicola, fl to: destin, fl to: new orleans to: la jolla, ca to: rancho palos verdes, ca to: mahou riviera, ca to: cambria, ca to: monterey, ca to: san gregorio, ca to: montara, ca to: millerton, ca to: mendocino, ca to: coos bay, or to: rockaway beach, or to: ocean park, wa to: forks, wa to: boston, ma

Friday, December 21, 2007

Sushi cruise

The fish can't get any fresher than this, unless you're a shark.

Wednesday, December 19, 2007

Powers of 2 written in base 26

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Friday, December 14, 2007

Newtonian bending of light

Under purely Newtonian mechanics, if you take a particle of infinitesimal mass traveling at the speed of light, and it barely skims above the surface of the sun during a solar eclipse, the particle will deflect due to the sun's gravity, just like the way the sun causes orbits of the planets to curve. Therefore, the mere fact that the stars appeared displaced during the famous solar eclipse experiment did not prove Einstein's Theory of General Relativity because Newton's theory also predicts displacement.

Rather, it is the amount of displacement that matters. Einstein's theory predicts a different amount of displacement, or star light deflection, than Newton's theory does. I think this is because in Einstein's theory, matter causes space and time to curve, while Newton's law of gravitation, when thought about in a certain way, only deals with the curvature of space.

Therefore, the popular illustration of General Relativity, balls rolling around on deformable sheet, as well as the common explanation of the solar eclipse experiment, are all somewhat missing the point, as in their simpleness they could just as easily be an illustration or explanation of Newtonian mechanics.

The most significant conceptual difference between Einstein's theory of gravity and Newton's theory of gravity is that Einstein's predicts that gravity causes clocks to slow down.

Curved spacetime is a powerful and very appropriate mathematical tool for describing Einstein's theory of general relativity.

Cap damages to profit

Damages on copyright infringement should be limited to the profit made off of infringement. This will lessen the chilling effect of censorship taking place today with the excessive and outrageous lawsuits being filed by media companies against file sharing.

Coloring URLs

Hash your current URL into a pattern of colors around the browser frame. Then users can associate repeated visits to the same site with the same colors. It may guard against IDN and typo attacks and also helps establish an identity for opaque site names such as on the Onion network or Freenet SSKs.

Each browser should use a different color hashing scheme, like HMAC, in order to thwart an attacker from brute force trying to design a similar-colored spoof site as the target. You can fool some of the people some of the time, but not all the people all the time.

Saturday, December 01, 2007

Rex UCT

UCT might work well on misere hex.