Before electronic hand held calculators, the slide rule was widely used in Engineering, Science and Commerce for rapidly performing calculations involving multiplication and division which have to be accurate to not more than three or four decimal places. It can also be used for such operations as involution (raising to a power) and evolution (extraction of a root) and for calculations with trigonometric functions (sine, cosine, tangent, cotangent).

Appearing like a winged fairy-tale creature poised on a pedestal, this object is actually a billowing tower of cold gas and dust rising from a stellar nursery called the Eagle Nebula. The soaring tower is 9.5 light-years or about 90 trillion kilometres high, about twice the distance from our Sun to the next nearest star.

1. Nanotechnology - a definition


2. Types of Nanotechnologies


3. Microelectronic Transistors


4. Nano FET


5. Nano Electronics


6. Microscopes


7. Computation Nanotechnology


8. Nanotechnology products


9. Major achievements of Nanotechnology


10. Some future Nanotechnology medical product ideas


11. References

An accurate, real-time planetarium viewable through your browser — and all made in Flash.

This project is an evolving work in progress, permanently under development. There aren't any planets or constellation lines at the moment, but it's on my wishlist.

Once upon a time, the mantra for scientific success was "Think big." Nowadays, it's all about the ongoing mission to make things really, really small. Here, a look at the latest in Lilliputian developments.

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Why settle for the standard stereo or a GPS unit when you can have an in-car PC running off your car's battery to guide the way, watch the engine, and download tunes?

How does a rainbow form? Is levitation possible? Do time machines exist? What does 'quantum' mean? What is the maximum force value found in nature? Is 'empty space' really empty? Is the universe a set? Which problems in physics are still unsolved?

This site publishes a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written to be entertaining, surprising and challenging on every page. With little mathematics, the text explores the most fascinating parts of mechanics, thermodynamics, special and general relativity, electrodynamics, quantum theory and modern attempts at unification. The essence of these fields is summarized in the most simple terms: it is shown how they are based on the notions of minimum entropy, maximum speed, maximum force, minimum change of charge and minimum action.