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The perils of big gravity data

According to NASA, the new Earth Gravity Model EGM2020, although not yet released, has been completed, .It will be based on a great deal of new data and will be a valuable addition for regional studies. But, like its predecessors, there is a danger that it will be misused.

Rand as a prophet

Ayn Rand is often credited with having made predictions that later came true, but all she ever did was follow generations of better and wiser people in deploring corruption. When it came to suggesting realistic measures to counter corruption, she failed completely.

Ida’s Sumatra Journey

Perhaps the most determined of all the women who travelled during the 19th Century was a Viennese widow called Ida Pfeiffer. One of her most dangerous undertakings was to enter, unaccompanied by any other Europeans, into the lands of the Bataks of Sumatra

The break-up of the Banda slab

Plots of earthquake hypocentres on north-south swathes across the Banda Sea show that the northern and southern Wadati-Benioff Zones zones involve the same slab of subducted lithosphere. But can that scoop-shaped slab hang together?