Magnetohydrodynamic Propulsion

MHD propulsion is a revolutionary type of propulsion system that doesn't use propellers to power ships and submarines but instead uses a magnetic force on the current. The method eliminates motors, drive shafts, gears as well as propellers, so it proposes to be a low-noise system with great reliability at low cost. 

YAMATO1 was the first such boat ever made to make use of this revolutionary technology. It was built in the early 1990s by Mitsubishi heavy industries Ltd. and was driven by liquid helium-cooled superconductors and could travel at 15 km/h or 8 knots.

Numerical Coincidences of the Universe

Science is an experimental, factual, measurement driven endeavor incorporating high degree of precision. There are  wide ranges of constants that form the crux of our physical theories and in many a cases translate them from theoretical assumptions to practical measuring mechanisms of numerical data in observations. So physical constants have deep implications on the strength of different phenomena we observe and experience and their values have been established with extreme precision and accuracy. 

For example, the age old Newtonian theory on gravity tells us that gravitational force between two point masses is directly proportional to the product of the masses and inversely proportional to the square of the distance separating them. However this simple statement is not enough to get the actual value of the force between them. There comes in the Universal Gravitational Constant(G) without which measurement of the actual magnitude of force was quite impossible. Some other such constants are Planck's Constant(h), speed of light(c), Boltzmann's Constant(k) etc.

However, these numerical constants have been observed to be subject to certain strange coincidences and relations. Some of such coincidences even implicate that our so called constants perhaps aren't even constant. So in this article we have a look at such ideas. There are mainly two main divisions of such coincidences and we will take them up one by one.