Sunday, April 12, 2009
From Laila
Wednesday, April 8, 2009
Too bad it wasn't sunny; we promise, it wasn't our fault.
Special thanks to the Newton Public Library for so kindly acommodating our often disruptive film-making and to Johnny's Luncheonette for the French toast.
Special no-thanks to Whole Foods for banning cameras from their store...or at least trying to.
Miasma of Gasma
Chestnut Hill Reservoir
Wednesday, April 1, 2009
Name That Tune!
Three things to note:
1. There are 18 song clips. That was on purpose. 18 = חי
2. The length of the clip is 56 seconds. Fifty-six divided by two...equals...28! Isn't that nifty?
3. The first 2 people to correctly identify all 18 songs will win a prize. I don't know what that prize will be - we'll all be surprised.
Two more things to note:
1. Are you impressed with the Wordle? Make your own here.
2. The clip ends with some good advice. Follow it and wear sunscreen!
Birkat HaChamah hits NYC!
If the following story wasn't true, it would be the obvious headline for the April 8th, 2009 edition of The Onion. See what happened in 1897 when a group of Jews tried to bless the sun...and please, call the police and tell them what you're doing before you gather in public to say Birkat HaChamah!
From time immemorial, the sun has played a central role in the lives of humans. From the vast numbers of societies for whom the sun has a religious significance, to modern day scientists who investigate its chemical composition and effects on our communications systems, the sun has always held a great deal of interest for humanity.
For most of human history, the sun was assumed to move around the earth (a doctrine called "geocentrism" which means "earth at the center." Sometimes it is also called "Ptolemaic" after its founder Ptolemy). Although today, we all take the sun's immobility for granted (our system is called "heliocentric" which means "sun at the center." Sometimes it is also called "Copernican" after its founder Copernicus), it is not hard to see how on first examination, the movement of the sun around the earth would be a natural assumption. The main piece of evidence for this position is that when you go outside, the sun appears to move across the sky.
But let's imagine for a moment that we DID'NT know that the earth moved around the sun, or let's say your skeptical friend demanded proof. He or she might say, "The sun looks like it moves, who are you to say different?" Well, when astronomers look at the night sky, they can identify where the other planets are. From night to night, they see the planets move relative to the background of more distant stars. If the earth were stationary, the planets should move in a straight line. However, the planets actually appear to move back and forth at random. To picture this, you might imagine being in a car on a highway. If you assume that you are not moving, the cars in the lane over from you appear to pass you, then reverse direction and then pass you again. However, if you realize that both your car and the others are moving, your observations become easy to explain!
Simliarly, a video simulation of the solar system designed from the assumption that the earth does not move, would require the planets to follow strange paths. But as soon as you allow the earth to move as well, the paths look much more normal. The reason we believe that the earth goes around the sun, is that the paths of the planets make more sense that way. Watch the video below and notice how for the first 25 seconds the sun (the bright spot) moves. At around 0:25, the whole picture shifts and becomes far more simple.
Here's another cool simulation of a Ptolemaic solar system: