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Multivariable Calculus: Gradient, Divergence, and Curl

Thank you for your comment in answer to my previous observation and question. Your answer advises us that magnetic-field reversal perhaps arises in "about 1000 years, but recent observations indicate maybe sooner." Do we know about how much -- ...

DerdriuMarriner, on 01/07/2026

Polar Coordinate System

Thank you for your comment in answer to my previous observation and question. The fifth subheading, Polar graphs, contains, with its information about limaçons, the statement that "If the magnitude of a is between the magnitude of b and of 2b ...

DerdriuMarriner, on 01/07/2026

TheThousand Year Garden

The next-last sentence in the last subheading, Conclusion, alerts us that "beautiful places are oft threatened by capitalists endeavouring to turn them into car parks." Are such changes as beautiful garden to car park arising because of the ...

DerdriuMarriner, on 01/07/2026

TheThousand Year Garden

A number oxsaxon aristocrats kept hold of personal wealth and land, for a while, if they did not fight for Harold. But it was a shor5 term measure, eventually they inte4rmar8ed with the saxonxs

frankbeswick, on 01/07/2026

Overcoming Difficulties Encountered with Mathematics

Yes, but math skills imply one has developed logic. I do not consider rote learning of math processes as worthwhile. Students should always ask why, and building on understanding.

blackspanielgallery, on 01/05/2026

Aurora Can Disrupt Electrical Devices And Even the Grid?

Aurorae can by electrical induction.

blackspanielgallery, on 01/05/2026

UAPs, Formerly UFOs, If They Are Real How Can We Explain Their Arrival to Earth?

G0 to YouTube and look at Mike Brown of Cal Tech. He has some insights. The world awaits visual confirmation, to prove it is not a cluster of small objects altering orbits of Keiper Belt objects. Best guess is it would be something like ...

blackspanielgallery, on 01/05/2026

Polar Coordinate System

Since there is no need it could run into opposition. Scientific article space is inadequate, so something less significant could find difficulty in being included.

blackspanielgallery, on 01/05/2026

Multivariable Calculus: Gradient, Divergence, and Curl

We do not know. The magnetic field reverses on about a 180000 year cycle, but it happens quickly. Rocks from a volcano showed the shift happens quickly. It does not happen over the Earth all at once. Since it has not happened in recorded ...

blackspanielgallery, on 01/05/2026

TheThousand Year Garden

Thank you for your comment below in answer to my previous observation and question. Is it known how it is that King Harold the Fair's sister itinerated from Norman England with her "considerable wealth" intact?