Thursday, April 20, 2017

[links] Electric Sand and Other Glories

Titan is covered with dunes and plains made of sand consisting of a range of organic molecules. Méndez speculated that the moon's sand might readily become electrically charged, making its behavior significantly different from that of Earth sand.
Méndez's specialty is electrified particles. He investigates phenomena such as volcanic lightning, which is powered by electrically charged volcanic ash particles, and studies "powders in the pharmaceutical industry, which can clump together or stick to the walls of pipes because of their electric charge," he said.

Tatooine world could be habitable despite its inevitably complicated orbit, as long as the planet stays within a particular range of distances from its two host stars, researchers said.
"This means that double-star systems of the type studied here are excellent candidates to host habitable planets, despite the large variations in the amount of starlight hypothetical planets in such a system would receive," Max Popp, an associate research scholar at Princeton University in New Jersey and the Max Planck Institute of Meteorology in Hamburg, Germany, said in a statement.

Hawk moths convert nectar to antioxidants. When animals expend a lot of energy, like hawk moths do as they rapidly beat their wings to hover at a flower, their bodies produce reactive molecules, which attack muscle and other cells. Humans and other animals eat foods that contain antioxidants that neutralize the harmful molecules. But the moths’ singular food source — nectar — has little to no antioxidants.

So the insects make their own. They send some of the nectar sugars through an alternative metabolic pathway to make antioxidants instead of energy, says study coauthor Eran Levin, an entomologist now at Tel Aviv University. Levin and colleagues say this mechanism may have allowed nectar-loving animals to evolve into powerful, energy-intensive fliers.

Untangling the mystery of why shoelaces come untied.
Based on the video, and the other tests they did on shoelace knots, the team says two things happen when a lace comes untied. First, the impact of the shoe on the ground loosens the knot. With the knot loosened, the whipping of the free ends of the laces — as the leg swings back and forth — makes the laces slip.

As the foot hits the ground and the laces swing repeatedly, the knot loses integrity until, in a matter of seconds, it fails altogether.

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