Electromagnetism, or the electromagnetic force is one of the four fundamental interactions in nature. The other three are the strong interaction, the weak interaction, and gravitation. This force is described by electromagnetic fields, and has innumerable physical instances including the interaction of electrically charged particles and the interaction of uncharged magnetic force fields with electrical conductors. (from wikipedia.org)
1) [00:00:00] Earth's Magnetic Field
2) [00:09:45] Magnetism and Electron Flow
3) [00:19:20] Domain Theory
4) [00:29:00] The Motor Principle
5) [00:38:35] Electromagnetic Induction
6) [00:48:20] Life in the Field
Benjamin Franklin was a prodigious inventor. Among his many creations were the lightning rod, glass armonica (a glass instrument, not to be confused with the metal harmonica), Franklin stove, bifocal glasses and the flexible urinary catheter. Franklin never patented his inventions; in his autobiography he wrote, "... as we enjoy great advantages from the inventions of others, we should be glad of an opportunity to serve others by any invention of ours; and this we should do freely and generously."
His inventions also included social innovations, such as paying forward. Franklin's fascination with innovation could be viewed as altruistic; he wrote that his scientific works were to be used for increasing efficiency and human improvement. One such improvement was his effort to expedite news services through his printing presses. (from wikipedia.org)
Entirely new forms of lightning have been discovered, up to 1,000 times bigger than any previous bolt seen. While normal lightning fires down below clouds, these giant bolts shoot up 80km into space. This lightning, six times more powerful than passenger planes are designed to withstand may be the real killer in a spate of baffling air disasters. And for the documentary revealed the photograph that sparked a secret NASA enquiry. Was this the proof that a high-altitude lightning strike caused the crash of the space shuttle Columbia?
