Recent content by Ken Fabian

Well, the Rift Valley (not the Nile) is where most of the fossil evidence of earliest humans (hominids) is found. That is not the same as the range where hominids lived - fossils aren't made everywhere.

I think that level of integration may have it's place in larger systems - the larger multi story residential and commercial buildings and businesses that provide central heating and cooling or do lots of refrigeration. It seems like refrigeration is just one element, possibly not the easiest...

Yes, these are representative/consequences of sea surface temperatures and differences in them, which are major drivers of weather patterns; wind strength, direction, likely humidity and therefore potential rainfall are largely determined by sea surface temperatures. For Eastern Australia where...

I see big differences between migration to areas unoccupied by other humans - those earliest of migrations - and migrations later, into regions where humans were already present. And differences again where humans were present and there were large relative technology differences and where there...

So... like a composite image but not?

@PeterDonis - Colour me surprised; I was thinking it might be a composite image - the thin crescent and some glow further out indicating light from behind. I didn't realise night time pictures could be enhanced like that.

You sure the sun is behind the Earth in this pic? Remarkable colour photography of night-side if that is the case. More usually we would be seeing city lights.

Not sure, but it does seem like Lang's lay is used primarily in wire ropes rather than fibre ropes. I think fibre ropes would be inclined to unravel that way, without the opposing winding to sustain it, whereas metal ropes will retain their winding.

The planet is VERY large and over very long periods of time - hundreds of millions of years - meteors will hit in all kinds of places with all kinds of uniquely local conditions. Yes, such materials would mostly land in oceans or on land but when a carbonaceous meteor hits a shallow sea the...

@DaveC426913 I thought SFFWorld did - a few years since I visited - but when I looked to check I didn't find it. I did visit a couple of others here and there. Now I don't know which forum I saw that. (I didn't make that up, I swear!.)

YASID - Yet Another Story ID - is common usage on forums dedicated to fiction, sometimes having its own dedicated thread.

Twisted fibre type ropes usually have three smaller twines (fibres twisted together) combined by twisting in the opposite direction - the smaller twines are initially overtwisted whilst under tension so that they provide a counter force that will wind the three together. The finished rope has a...

@AI_ It is possible that flywheel storage will emerge as the superior option; predicting the future is hard. Nuclear is high on the list of options, but may need improved versions that can be ramped up and down according to varying demand or else need storage to go with it, but less storage...

Wouldn't the Coriolis Effect for a person walking on the inside of a centrifuge be between head and feet? Or flying, between their axis side and perimeter side? (And dependent on circling the axis?) One of the Rama stories (1st?) had someone flying the axis in a person powered craft... and...

Which is not as much as I would have expected. Also I would expect higher 'dry' mass for a nuclear rocket, so less than twice for similar payloads, so not nearly as much gained by using them as comparing exhaust velocities suggest. Dry mass (is that the correct term?) is an issue for ion rockets...