Description
Transcript: Humans are special. There is no escaping that fact. On this planet, humans are the only creatures that have evolved the capability to adapt to their environment and control their global environment. Humans have also developed the ability for abstract thought, for mathematics, and humans have figured out ways of understanding the entirety of the universe that they live in which is a fantastic achievement in only a few thousand years. But what at a genetic level is special about the large brains of humans? In one sense, the complexity is truly amazing. The human genome has information content in a four letter alphabet equivalent to a large book or an encyclopedia, some billions of bits of information. However, the human brain has ten to the twelve or a trillion cells, and these cells have ten to the power fifteen or a thousand trillion connections. These electrical-chemical connections and the networks they form are the basis for our intelligence. Ten to the power fifteen is a huge number, and it implies a large amount of complexity. Obeying Moore’s Law, if computers were to continue to develop as they have done, computers could potentially rival this level of connectivity and storage of information in about twenty years. We have no idea whether this means that humans can develop technology that becomes intelligent as well.
Transcript: The history of life on Earth is not a simple linear progression from simple to more complex, from bacteria to us. There have been many twists and turns in this tale, many evolutionary dead ends. Chance effects are important on the history of life, for example, the role of giant...
Published 07/29/11
Transcript: If planetary scientists are asked to speculate on the most possible sites for life within the solar system, they will generally give five places: Mars, Venus, Europa, Titan, and Io. These five places are significant. Mars is a traditional place where we might imagine life could have...
Published 07/28/11
Transcript: It’s particularly important to consider the possibility of life on or in the gas giant planets of the solar system because these are the type of planets that have been found around nearby stars. Over a hundred extrasolar planets are now known, and most of them are Jupiter-like or...
Published 07/28/11