http://www.FreeScienceLectures.com This video presents dark solitons in a trapped Bose-Einstein condensate decaying into quantum vortex rings. Simulation of condensates with vortices in rotating anisotropic traps, then a 12-vortex array, then condensate containing a soliton in a spherical trap. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: solitons soliton waves bose-einstein condensate dark solitons quantum rings anisotropic trap spherical trap
Added: Sun, 17 Jun 2007 05:09:08 GMT

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http://www.FreeScienceLectures.com Sodium is a chemical element which has the symbol Na (Latin: natrium), atomic number 11, atomic mass 22.9898 g/mol, oxidation number +1. Sodium is a soft, silvery white, highly reactive element and is a member of the alkali metals within "group 1" (formerly known as 'group IA'). It is classified as an "inorganic macro-mineral". t has only one stable isotope, 23Na. Sodium was first isolated by Sir Humphry Davy in 1807 by passing an electric current through molten sodium hydroxide. Sodium quickly oxidizes in air so it must be stored in an inert environment such as kerosene. Sodium is present in great quantities in the Earth's oceans as sodium chloride. It is also a component of many minerals, and it is an essential element for animal life. This video shows what happens if you place a piece of sodium in water. It does not react as quickly as potassium or lithium. The reaction is slower, initially causing it to burn and as the temperature rises, it is probably broken into more pieces, exposing more surface area to water, the reactions speed up and the piece explodes. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: sodium water reaction na alkali fire burning explosion
Added: Sun, 17 Jun 2007 04:35:00 GMT

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http://www.FreeScienceLectures.com Here is an experiment where sodium reacts with four different acids - 6M HCl, 12M HCl, 6M HNO3 and 15M HNO3. The reaction with 15M HNO3 is the fastest and 12M HCl is the slowest reaction and it still hasn't all reacted even after 75 seconds --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: sodium reaction HCl HNO3 acid fast slow experiment hydrochloric acid nitric acid
Added: Sun, 17 Jun 2007 04:21:31 GMT

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http://www.FreeScienceLectures.com Sodium does not react easily with oxygen at a room temperature so it has to be heated up a little for the reaction to start. Since air is mostly oxygen once the reaction starts it gets pretty violent and the piece of sodium explodes. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: sodium air reaction oxygen burning fire explosion heat
Added: Sun, 17 Jun 2007 04:01:37 GMT

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http://www.FreeScienceLectures.com Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the "Red Planet" because of its reddish appearance as seen from Earth. A terrestrial planet, Mars has a thin atmosphere and surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. It is the site of Olympus Mons, the highest known mountain in the solar system, and of Valles Marineris, the largest canyon. In addition to its geographical features, Mars' rotational period and seasonal cycles are likewise similar to those of the Earth. This video shows the rotation speed of the red planet Mars relative to Earth, the seasonal cycles on Mars and its surface structure. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: red planet planet earth mars rotation surface seasons map
Added: Sun, 17 Jun 2007 03:19:54 GMT

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http://www.FreeScienceLectures.com Accidents happen. Even at NASA where they have strong testing and integrity procedures. A rocket carrying a GPS 2R just seconds into the mission explodes. More than 250 tons of flaming debri and rocket fuel rain down from the sky. The explosion occurs so close the the ground that the area around looks like a war zone. Amazingly no one is injured! The investigators later determine that there was a 17 foot crack in one of the boosters. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: accident rocket gps 2r satellite sattellite sattelite booster crack explosion fuel debris
Added: Sun, 17 Jun 2007 02:16:02 GMT

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http://www.FreeScienceLectures.com This video is from 1981. The interview is also the subject of Feynman's book The Pleasure of Finding Things Out. I have a friend who's an artist and he's some times taken a view which I don't agree with very well. He'll hold up a flower and say, "look how beautiful it is," and I'll agree, I think. And he says, "you see, I as an artist can see how beautiful this is, but you as a scientist, oh, take this all apart and it becomes a dull thing." And I think he's kind of nutty. First of all, the beauty that he sees is available to other people and to me, too, I believe, although I might not be quite as refined aesthetically as he is. But I can appreciate the beauty of a flower. At the same time, I see much more about the flower that he sees. I could imagine the cells in there, the complicated actions inside which also have a beauty. I mean, it's not just beauty at this dimension of one centimeter: there is also beauty at a smaller dimension, the inner structure... also the processes. The fact that the colors in the flower are evolved in order to attract insects to pollinate it is interesting - it means that insects can see the color. It adds a question - does this aesthetic sense also exist in the lower forms that are... why is it aesthetic, all kinds of interesting questions which a science knowledge only adds to the excitement and mystery and the awe of a flower. It only adds. I don't understand how it subtracts. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: richard feynman flower friend flower colors insects mystery
Added: Sun, 17 Jun 2007 01:32:36 GMT

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http://www.FreeScienceLectures.com The plane is vibrated at some specific frequency. The waves travel across the plane and at some places they add together and at other places they cancel out. Where they cancel out the salt stucks because there is no vibrations and at other places it just gets vibrated away. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: resonance plane salt node antinode interference destructive constructive
Added: Sun, 17 Jun 2007 00:39:25 GMT

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http://www.FreeScienceLectures.com Ever seen a shark like this? This species of prehistoric shark called Frilled Shark and it is very rarely seen alive because its natural habitat is some 600 meters or more under the sea. The frilled shark, Chlamydoselachus anguineus, is a primitive shark species, of the family Chlamydoselachidae in the order Hexanchiformes. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: japan shark frilled shark prehistoric sea ocean
Added: Sat, 16 Jun 2007 23:43:50 GMT

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http://www.FreeScienceLectures.com This video shows action much slower than you see on television or with your eyes. For example, a puma running ten times slower, you can see every muscle moving. Then some bird flying 10 times slower. But that's not all! A better camera can record up to 1000 times slower! An exploding balloon is shown at normal speed of 25 fps and 80 times slower. Even a simple action is transformed, revealing beauty and incredible details that we could not have glimpsed any other way. With these types of cameras we are able to investigate the fastest animals in the world! --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: high resolution slow motion high fps puma bird camera balloon explosion incredible details
Added: Sat, 16 Jun 2007 22:58:00 GMT

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http://www.FreeScienceLectures.com When potassium is heated is starts reacting with oxygen. Since air is mostly oxygen, the reaction happens pretty quickly and it starts burning. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: potassium heat oxygen air reaction fire burning
Added: Sat, 16 Jun 2007 11:02:24 GMT

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http://www.FreeScienceLectures.com A slow motion video of a corn popping. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: slow motion high resolution corn popcorn burst explode
Added: Sat, 16 Jun 2007 10:46:02 GMT

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http://www.FreeScienceLectures.com Do you know how tiny Earth is compared to other planets and stars? We are very very tiny! Earth is compared to Venus, Mars, Mercury and Pluto. Then to Jupiter, Saturn , Uranus and Neptune Then to the Sun. Then to Arcturus - the brightest star in the northen hemisphere, and other smaller stars - Pollux and Sirius. Our Sun is a tiny dot in the Milky Way! Earth is even smaller! --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: earth venus mars mercury pluto jupiter saturn uranus neptune sun arcturus pollux sirius planets stars milky way galaxy sky nasa hubble telescope
Added: Sat, 16 Jun 2007 10:19:24 GMT

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http://www.FreeScienceLectures.com Neutrophils are our body's first line of defense against bacterial infections. These cells can recognize certain chemicals and move to the source of these "chemoattractants" by migrating up the chemical concentration gradient or "toward the smell". The neutrophils were placed in a gradient of fMLP (n formyl methionine- leucine- phenylalanine), a peptide chain produced by some bacteria that is used by the neutrophils to find infecting organisms. The cells charge out like a "posse" after the bad guys. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: cell neutrophil chemotaxis bacteria bacterium defense
Added: Tue, 12 Jun 2007 08:39:41 GMT

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http://www.FreeScienceLectures.com Human neutrophils are mobile cells that will quickly migrate to sites of injury to help fight infection. They are attracted there by chemical signals released by other cells of the immune system or by invading microbes. In this experiment substance is released from micropipette that makes the neutrophils polarize and move towards that location. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: human blood neutrohpil chemataxis cell bacteria microbes chemical signal micropipette polarization experiment
Added: Tue, 12 Jun 2007 08:17:47 GMT

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http://www.FreeScienceLectures.com We travel inside nucleus to see how the DNA replicates. When DNA replicates its strands are separated by enzine helicase. Single-stranded DNA binding proteines keep the strands from (...?). One DNA strand encodes the leading strand using DNA Polymerase III. Just watch to see what is going on. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: dna replication enzine helicase strand polymerase encode okazaki fragments rna primase rna primer dna ligase
Added: Tue, 12 Jun 2007 06:28:49 GMT

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http://www.FreeScienceLectures.com The video shows how each planet scales in size relative to each other. The exploration begins at the smallest planet Mercury which has diameter of just 4880 km, then comes Mars (6794 km), Venus, Earth (12756 km), Neptune, Saturn, Jupiter (142984 km), Sun, Sirius, Pollux, Arcturus (4177500 km), Rigel, Beteigeuze, Antares (1108430000 km), My Cephei, VV Cephei (288194 times bigger than Earth). Pretty impressive! --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: planets stars mercury mars venus earth neptune saturn jupiter sun sirius pollux arcturus rigel beteigeuze antares my cephei vv cephei
Added: Sun, 10 Jun 2007 21:22:52 GMT

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http://www.FreeScienceLectures.com The universe began with the big bang, and for the first four hundred thousand years all matter was ionised, indicated by the blue region in the diagram. When the universe had cooled enough to allow atoms to form, there followed a period known as the dark ages, during which matter condensed into the first stars and galaxies. After 150 million years the first stars ignited and began to emit visible light. The grey circle marks this time when the first galaxies can be seen. The white circle represents the spacial dimensions of the universe. As time passes, the circumference of the circle increases, corresponding to the expansion of the universe. Time is represented by the radius of the circle, and travel through space is represented by rotation around the circle. For simplicity, only one spacial dimension is shown in the diagram, but the remaining two dimensions behave in the same way. Matter remains almost stationary on the circle, but light rotates around the circle at a constant angular velocity. The location of our solar system is indicated by the green dot. To examine our view of the universe, lets zoom in to our region, and start from time zero. The blue dot is a supernova explosion that occurred around the time of the first galaxies, and is visible to us today. The light from the supernova explosion propagates in all directions, and its wavelength is gradually shifted towards the red end of the spectrum as the universe expands. It is not visible to us until the light arrives at the Earth at the present time. The only section of the universe visible to us today is along this light path. However, this does give us a representative cross-section of the universe all the way back to the big bang. We can see how the view of the universe from our solar system evolves with time, by restarting again from time zero. The light curves show the cross-section of the universe that is visible at any time. Notice the intersection of the light curves with the time of the first galaxies. As the age of the universe increases, the first visible galaxies continually change as new galaxies come within range of our solar system. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: big bang matter stars galaxies light solar system time space supernova expansion earth
Added: Sun, 10 Jun 2007 20:32:27 GMT

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http://www.FreeScienceLectures.com When nuclear fuel is sent from powerstations to reprocessing, a simple procedure is used which now has been carried out safely more than 14'000 times. The fuel rods are first cooled for at least 90 days at power station by immersing them in ponds. When taken out of storage the heat coming from each rod has dwindled to about 25 watts - roughly equivalent to a small electric light bulb. About 200 rods at a time are loaded into an open top steel skip which is then placed inside a special container called a flask. The flasks are very robust - they weigh around 50 tons and have walls 35 cm thick. 16 bolts, each able to take a load of 150 tons without breaking, secure the lid. The flasks are forged out of two blocks of steel. When finished each flask is worth half a million pounds. Stringent manufacturing and performance standards have to be met. These are drawn up by International Atomic Energy Agency. To meet these standards the industry has developed a comprehensive testing program. Literally hundreds of impact tests have been carried out using scaled models dropping them so that they land from all sorts of different angles. In 1983 to enhance public confidence in the flasks a full scale testing of an actual production flask in real life conditions was begun. A three locomotive train was smashed into a flask going at 100mph. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: nuclear fuel nuclear flask power station fuel rods steel skip bolts standards iaea impact test train
Added: Sun, 10 Jun 2007 18:14:30 GMT

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http://www.FreeScienceLectures.com A nuclear flask made out of 280 tons of solid steel. It is important that these flasks are safe so they are tested extensively! At one of the tests where the flask was filled with water and dropped from some height a stream of water was spotted to leak out. This was unacceptable and further improvements to the flask were made. To prove that they are safe now one was put on a train moving 100mph (~160km/h) and was crashed into another one located end of train track. The explosion was pretty massive. There was some buckling and some scaring on the metal of the flask but pressure tests revealed that the contents was safe. Similar tests go on around the world. A different test in Albuquerque. New Mexico and a different flask on a lorry. The train hurtles towards the lorry. The train is destroyed by the flask survives the 80 mph impack (~130 km/h). Then another test. A flask is put on rocket powered truck and smashed into a concrete wall. At 60mph (100km/h), the flask is unharmed, there is not even enough damage to measure. So they load it on another truck and do it all again but this time faster at 80mph. At first the flask does look as if it is damaged. But it's just a little of lorry debri. So they put it on a train powered by a rocket sled. Although everything around is damaged, the flask itself is fine. So they make the final test putting it to 14000 deg's fahrenheit (8000 C). The flask kept cool. It survived everything they threw at it. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. ---

Author: FreeScienceLectures
Keywords: nuclear waste nuclear flask 280 tons steel train crash rocket truck damage intact burning
Added: Sun, 10 Jun 2007 13:32:54 GMT

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