Florida tragedy: So what makes a sinkhole open up?

Imagine a limestone gorge. Look back in time and imagine it covered over. And then think what happens at some time between the two. Imagine standing above ground at that stage and discovering the first hole in what was then a cavern 'roof' when the ground opened up. And you're thinking of a sinkhole.

Anish Kapoor, Lisson Gallery, London

Is there something new from Kapoor amongst this multitude of new scuptural works spread across the various gallery spaces of two entire buildings? Not much. We can divide these work into the rough and the smooth.

Nasa releases first Mars images from Curiosity rover

Nasa yesterday showed off the first high-resolution, colour portrait images taken by the Mars rover Curiosity, detailing a mound of layered rock where scientists plan to focus their search for the chemical ingredients of life on the Red Planet.

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Marina Salye: Distinguished geologist who became a vociferous opponent

Marina Salye was a geologist of considerable repute, locating mineral deposits in the furthest and least hospitable reaches of the Soviet Union and producing dozens of academic papers and six monographs. But she came to prominence as a pugnacious and eloquent leader of the perestroika-era democratic movement in Leningrad, and as a sharp critic of Vladimir Putin ever since she uncovered gross financial malpractice in his St Petersburg office in the early 1990s.

Fire and ice: Strap on your snow shoes and explore Mount Etna

There is one vital ingredient to every snowshoeing trip. And that's snow. Pulling back the curtains of my hotel room window, I gazed out at the sheer slopes of Mount Etna. There wasn't a flake to be seen. Did Luca, my guide, have some bad news? "Don't worry," he said, while loading our snowshoes into the van.