Impossible? Perhaps not!

Lord Kelvin

Throughout the history of science there have been proofs that something is impossible. These proofs are usually true in mathematics, such as that it is impossible to generate the number π with a ruler and compass. Despite which, many amateurs continue to assert that they have made it. I myself have had to face one of these “proofs”.

Another similar case is the proof, this time related to physical science, that it is impossible to build machines with perpetual motion, because they oppose the first or the second principle of thermodynamics. Also, in this case many amateurs insist that they have made it. In these cases, one should not waste time looking for the error, which is known to exist.

Science and hate for religion: a personal anecdote

John McCarthy

Since 1995, Internet has become an almost indispensable tool for many people. Our society is increasingly dependent on the global data network, which means that we are increasingly vulnerable. A solar flare, a large meteorite, an overload of energy networks, a major war, can endanger our social structure, making it impossible to use Internet.

In the late 1980s, Internet was just a fledgling network linking together private companies, whatever their hardware and software. In fact, it was one among many networks competing for the new ecological-social niche. One of the most important of these networks was BITNET, which linked all the universities in North America using IBM computers. Later, a parallel network was created in Europe, called EARN, which was soon connected to BITNET.