Tag Archives: red

Lengthy Post: Races, Historical and Modern

Race, a controversial topic, has been the reason for hate crime, genocide, discrimination, disenfranchisement and other atrocities. But what is race really? Race appears to be a human method for classifying other groups of humans, distinguishing “us” from “them”. Most determinants of race are outward physical traits, namely facial features, build and skin color. The last feature, skin color, is a prominent distinguishing feature of the races, which have been separated in color groups. Historically, the Caucasian peoples have been associated with white, East Asian peoples with yellow, North African, Middle Eastern and South Asian peoples with brown, Sub-Saharan and Australian Aboriginal peoples with black and Amerindian peoples with red. Still another racial definition is based on ancestral homelands. Caucasian people from Europe, North Africa, the Horn of Africa, the Middle East and Central and South Asia, Negroid people (these are historical terms, you can expect racism) from Sub-Saharan Africa and Australia, Mongoloid people from East, South East, North, and Central Asia, the Americas, the Arctic and some Pacific islands. Recent genetic research has uncovered some evidence of separate races, but based on adaptations to a homeland while retaining inter-race breeding capability (every different race is still part of the same species). A 1994 study set up 9 potential races: African, New Guinean & Australian, Pacific Islander, Southeast Asian, Amerindian, Arctic Northeast Asian, Northeast Asian, European Caucasoid and Non-European Caucasoid. Racial studies continue to be controversial, but perhaps through studying race we might learn it doesn’t exist.

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Filed under Biology, Culture, Science

Speeding and Blue Shift

Okay, so I’m assuming speeding on roadways is illegal in most countries, and that driving through a red light is also illegal. Okay? Okay. Let’s talk about blue shift. Blue shift is an application of the Doppler effect to light. Basically, if you travel in the direction opposite a wave, the apparent frequency of said wave increases, and the opposite is true if you travel in the same direction as the wave, the apparent frequency decreases. Since blue has a high frequency and red has a low frequency (as far as light goes) light is blue shifted when moving toward the light source. So now that that’s taken care of, how fast would you need to be going to see a red light at an intersecti0n as a green light. Using the speed of light, a frequency for red light (4.4*10^14 Hz), a frequency for green light (6*10^14 Hz), and Wolfram|Alpha, we get a speed of about 3/10 of the speed of light. That’s fast.

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Filed under Physics, Science