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Astonishingly, a multicourse lunch — a recent menu included a veil of lasagna-like cauliflower gelée over sturgeon tartare; Cueillette’s own bread, rubbly with the famous Corrèze walnuts — is currently €35, or about $38, possibly the most outrageous bargain in France right now.

It's far from the dusty landscape of northern Afghanistan where they come from, where often the rubbly roads are not even suitable to walk on.

Extreme weather here wreaks havoc on overland roads, which fluctuate between muddy and rubbly in the summer and inaccessibly icy in the winter.

“They check all of the boxes that are consistent with them being these captured asteroids,” said Dr. Fraeman — rubbly patchworks that drifted too close to Mars long ago and became trapped in the planet’s orbit.

Some four years later, having arrived at Bennu in December 2018, the mission is now in a lengthy preparation period for that oh-so-precious grab at a tiny piece of this rubbly, seventy-million ton repository of pristine material from the earliest days of our forming solar system.