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Thanks. I was thinking of this video by Jos Leys, or something very similar: Source: https://www.youtube.com/watch?v=OYZ-Ab9-WHI For those who haven't seen Jos Leys's channel, do check it out: he does some outstanding work, mainly with computerised animations.

Someone (sorry, I forget who) has pointed out on YouTube that if the sun moves in a circle parallel to the ground (the usual flat earth model), the tip of the shadow of a stick (gnomon) can only trace an arc of a circle on the ground. Which it never does in reality: it is either a straight...

{Mendel) Thanks. I live in the UK, where the latest reported mortality rate is about 4%. But tests are mainly carried out on people who are already showing serious symptoms, or with other major health problems, so this probably overstates the mortality relative to the true number infected...

Thanks. I hope you are right. But when otherwise similar countries like Germany and France show a 10x difference in the death rate, common sense also suggests a need for closer investigation. If Germany really has succeeded in keeping the death rate among infected cases to well under 1%, the...

There is quite a puzzle about the different death rates (ratio of deaths to infections) in different countries. Notably, the death rate in Germany seems much lower than in other European countries such as France and the UK, not to mention Italy (except I just did). There is a discussion in...

Flat Earth debunker Bobby Shafto, who does some great work, has successfully replicated Rory's 'horizonomatic' method from a height of nearly 500 meters and obtained a nice clear result. See his short YouTube video here: Source: https://www.youtube.com/watch?v=KWUAuAvzxyc

Me no physicist, but I would say a given volume of air with 'water dissolved into it' will be more dense than the same volume of air with no water, other things being equal. But by taking up water vapour it seems that the air will also increase in pressure, since by Avogadro's Law the pressure...

Wow, that's a lot of work! I'm afraid I don't understand the math. What do the letters 'e' stand for? 'e' usually stands for Euler's number, but I don't see how that comes into it. Cavendish himself estimated the gravitational attraction of his weights, at the appropriate distances, as not...

This looks a lot better designed than most non-academic attempts at Cavendish experiments. (I won't mention some of the worst!) I like the way the equipment is shielded from air currents. Still, a few doubts occurred to me: a) there doesn't seem to be much rotation of the test weights around...

Over the few years I've been following the flat earth 'debate', the question of how aircraft manage to follow the curvature of the earth has come up a lot. I recall seeing three broad classes of explanation: 1. The pilot (or autopilot) will need to adjust the controls from time to time to...

If Eric Dubay makes a claim, that is prima facie evidence that the claim is false. I just checked out his YouTube channel. (I feel dirty, but someone has to do it.) The channel has hundreds of videos, mainly but not exclusively on flat earth, going back over a year, most of them with hundreds...

I suspect it is an adaptation of the quote attributed to various terrorist organizations that 'The security authorities have to be lucky every time. We just have to be lucky once.' In the UFO context it makes a reasonable point: even if just one of the many UFO sightings turned out to be a...

Splendid research! Just a point of terminology: in old-fashioned English, the term 'inst.' was used as an abbreviation for 'in the present month'. So in the Times article dated 13 May 1862, the references to the 6th inst. and the 10th inst. should be interpreted as dates in May. Putting...

The whole front page has been substantially revised. Note that even the weather forecasts are different: one is 'fair, mild', the other is 'fine, cooler'. I think the one with 'fine, cooler' is a later edition. Note that in the 'fair, mild' one there is a brief report under 'Late News'...

In World War II 'enemy aliens' (mainly Germans) in the UK were interned soon after the outbreak of war. The Isle of Man, being an island out of swimming distance from the mainland, was one of the main internment centres. From memory I think the internment applied only to non-UK citizens, not...

Correction to my previous comment: the Wikipedia reference to Stollberg is not to the town of Stollberg, but to a Stollberg Hill, which really does exist in the stated place. My apologies.

As promised earlier, I have borrowed a copy of R. V. Jones's Most Secret War (1978), known in the US as Wizard War. While at the Library I also noticed and borrowed Alfred Price, Instruments of Darkness (1967), which is a general study of the night-time air war in WWII. Price acknowledges...

This is just to note that the book described by Hepper as Wizard War, by R. V. Jones, is known in the UK as Most Secret War. I remember reading this some years ago, but I don't recall any details on Knickebein. I will try to read the relevant chapters again when I next go to my usual Library...

I don't have any expertise on this, but according to the various sources Knickebein transmitted in a frequency between 30 and 33Mhz. This is at the lower end of what is classified as 'VHF' (Very High Frequency), from 30 to 300 Mhz. The frequency range below this, 'HF' (High Frequency'), from...