I’m noticing a conspicuous absence of prestressed concrete.

The Venturi Effect is an observation which can be described by the Bernoulli Equation.

A venturi creates a low pressure region at its contraction. If the inlet to the venturi is at atmospheric pressure (for example), that means the contraction will be at a mild vacuum. Fluid flows are driven by a pressure gradient, and so if an alternate path is available to that vacuum, fluid will be driven in that…

This is not correct. Bernoulli’s equation is a statement of the conservation of energy for an inviscid, irrotational flow along a single streamline. So not only is it not derived from friction, it is not valid for flows with significant friction at all (that would invalidate the inviscid assumption). It is also not…

If I could be pedantic for a second: steel is a crystal in general. Most large steel parts will be formed from many adjacent crystals, and the size and shape of these crystals, and the structure they form is a major component of the mechanical properties of the steel, called the microstructure. Turbine blades will…

If those history books actually refer to the 1919 eclipse observation as lensing (which I very much doubt; your prior link certainly does not), then they are indeed wrong. However, what I think is much more likely is that we have a semantic gap: merely bending light is not lensing. Bending light is just bending light.…

I was referring specifically to the French Mirage III incident at Le Bourget to capture flow-vis images of the Tu’s unique canards through clouds, which the French government now concedes. Of course, this isn’t sending spies into Moscow to steal blueprints or something, but it did kill eight people just for some…

Keep in mind that while Soviet engineering was far out-paced by the West, Soviet science and mathematics were absolutely at the cutting edge. For instance, it was a Soviet scientist, at a Soviet university, publishing in Soviet journals, that developed the physical theory that stealth aircraft are based on. (P.Ya.…

Its interesting to think that the Tu-144 was the product of industrial espionage in totality when both its program launch and first flight occurred before that of Concorde. And so too the attention that the French gave to investigating the canards of Soviet aircraft when it visited Le Bourget. Certainly there is…

The Cold War was a proxy battle fought in the battlefield of deficit spending. Not only did this innovation result in less human death, but was much more brutally total in the conquering of the enemy; unlike in many wars where the losing country still exists in a subdued form, the Soviet Union was outspent into…

The Chinese maglev is not Chinese, its German. Indeed, the Chinese rail accident cited in this article wasn’t just “made to resemble a Japanese bullet train,” it was a E2 Series Shinkansen built by Kawasaki. The entire Chinese high speed network has been built by Western companies from Western countries. The world’s…

What you are describing is aperture synthesis (already used, most prominently, in radio astronomy in telescopes such as the VLA). Synthetic aperture radar is a type of aperture synthesis that uses many snapshots from a single moving antenna, as opposed to a single snapshot from multiple antennas as is the case in most…

Some things can be made small, some things cannot. Ultimately, if you’re trying to capture an analog signal (like any type of EMR), you need a big collector if you want high resolution. The Hubble’s 2.4m main mirror size was dictated by the decision to borrow tooling from US spy satellite construction - a 2.4m…

Think of a perfectly round pair of wheels. If any load is applied to the axle, the wheel will cease to be perfectly round: it will deform. This strain requires a certain amount of energy, supplied by the mass of the load dropping in height (potential energy of the load is converted into strain energy). Now if you…

(literally) not safe for work?

Legal experts have said that "natural born" seems to mean "born with US citizenship". By this definition, he qualifies. His mother was a US citizen, and therefore he was also a US citizen at the time of his birth, jus sanguinis; he simultaneously earned a Canadian citizenship at the time of birth, jus soli.

Originally, Canada reserved the Y prefix for airports that included a weather station. Many Canadian airports have a code that starts with X or Z, but none of these are major airports by any means.

Probably no more than .1 ton, drop the kilo.

In the full-size image you will note that this isn't a single shockwave with a flat top. Rather, there are two shockwaves: the first is a larger wave originating closer to the ground, and clearly more powerful due to the more clearly visible wavefront, while the second wave originates higher from the ground, and is a…

Plausible retcon: most explosions in movies are conflagration as opposed to detonation, and therefore have no shockwave.