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. ---

Added: June 16, 2007, 11:37 pm
Runtime: 02:14 | Views: 2579 | Comments: 0

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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. ---

Added: June 16, 2007, 11:14 pm
Runtime: 00:27 | Views: 2113 | Comments: 0

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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. ---

Added: June 16, 2007, 10:59 pm
Runtime: 00:39 | Views: 1822 | Comments: 0

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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. ---

Added: June 16, 2007, 10:37 pm
Runtime: 00:45 | Views: 2332 | Comments: 0

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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. ---

Added: June 16, 2007, 9:39 pm
Runtime: 03:04 | Views: 2239 | Comments: 0

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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. ---

Added: June 16, 2007, 8:44 pm
Runtime: 01:40 | Views: 2216 | Comments: 0

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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. ---

Added: June 16, 2007, 8:00 pm
Runtime: 01:43 | Views: 1693 | Comments: 0

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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. ---

Added: June 16, 2007, 7:03 pm
Runtime: 02:13 | Views: 1564 | Comments: 0

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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. ---

Added: June 16, 2007, 6:13 pm
Runtime: 01:34 | Views: 2638 | Comments: 0

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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. ---

Added: June 16, 2007, 6:20 am
Runtime: 01:41 | Views: 2360 | Comments: 0

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http://www.FreeScienceLectures.com Potassium is a chemical element. It has the symbol K (Latin: kalium) and atomic number 19. The name "potassium" comes from the word "potash", as potassium was first isolated from potash. Potassium is a soft silvery-white metallic alkali metal that occurs naturally bound to other elements in seawater and many minerals. It oxidizes rapidly in air and is very reactive, especially towards water. In many respects, potassium and sodium are chemically similar, although organisms in general, and animal cells in particular, treat them very differently. In this video a piece of potassium is thrown into water which causes it to oxidize very very quickly thus releasing lots of energy which can be seen in form of sparks and fire. --- 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. ---

Added: June 16, 2007, 5:56 am
Runtime: 00:19 | Views: 2361 | Comments: 0

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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. ---

Added: June 16, 2007, 5:40 am
Runtime: 00:31 | Views: 1752 | Comments: 0

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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. ---

Added: June 16, 2007, 5:26 am
Runtime: 00:21 | Views: 2398 | Comments: 0

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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. ---

Added: June 16, 2007, 4:47 am
Runtime: 01:45 | Views: 2088 | Comments: 0

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http://www.FreeScienceLectures.com Scientists listened to animals playing and they noticed something that appeared to them to be laughter. They studied this behavior for couple of years before acturally realizing that it is laughter. Soon they got a device which transformed higher frequency sounds to frequencies our auditory system can hear. So they developed a way to ask these rats if they liked being tickled and the answer was definite yes! --- 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. ---

Added: June 12, 2007, 3:47 am
Runtime: 01:31 | Views: 1913 | Comments: 0

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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. ---

Added: June 12, 2007, 3:17 am
Runtime: 00:45 | Views: 1778 | Comments: 0

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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. ---

Added: June 12, 2007, 2:53 am
Runtime: 01:17 | Views: 1946 | Comments: 0

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http://www.FreeScienceLectures.com HIV replication is a complex multi-staged process that includes crucial steps taking place on the exterior as well as the interior of the target host cell. The first three steps involved in cell entry are termed attachment, co-receptor binding and fusion. Each step is crucial to successful viral reproduction. Once HIV virus penetrates the cell, it releases its RNA into the cell. --- 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. ---

Added: June 12, 2007, 1:57 am
Runtime: 02:28 | Views: 2887 | Comments: 0

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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. ---

Added: June 12, 2007, 12:55 am
Runtime: 01:59 | Views: 2513 | Comments: 0

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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. ---

Added: June 10, 2007, 3:54 pm
Runtime: 01:35 | Views: 2994 | Comments: 0

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