xantox writes: "Using computer animation based on current molecular research it is now possible to see how "the book of life" is actually copied in living cells. This animation shows the outstanding "assembly line" of molecular machines, which pull apart the DNA double helix at the speed of a jet engine, and output a copy of each strand. About 1000 nucleotides are synthetized each second, with less than one error per billion. One strand is copied continuously, while the other is copied backwards in loops, one section at a time. The end result is two new DNA molecules."
xantox writes: "There are three strategies to travel 10.5 light-years from Earth to Epsilon Eridani and bring humanity into a new stellar system : 1) Wait for future discovery of Star Trek physics and go there almost instantaneously, 2) Build a relativistic rocket powered by antimatter and go there in 22 years by accelerating constantly at 1g, provided that you master stellar amounts of energy (so, nothing realistic until now), but what about 3): go there by classical means, by building a gigantic Ark of several miles in radius, propulsed by nuclear fusion and featuring artificial gravity, oceans and cities, for a travel of seven centuries — where many generations of men and women would live ? This new speculation uses some actual physics and math to figure out how far are our fantasies of space travel from their actual implementation."