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May 31, 2018

Starfish Whirlpools


From Science News:


A baby starfish scoops up snacks by spinning miniature whirlpools (above).

Their vortices catch algae and draw them up close so the larvae can ingest them, scientists from Stanford University reported December 19 in Nature Physics.

Before starfish take on their familiar shape, they freely swim ocean waters as millimeter-sized larvae.

To hunt for food, the larvae paddle using hairlike appendages called cilia.

The scientists found that the larvae adjust the orientation of these cilia to fine tune their food-grabbing vortices.

Scientists studied larvae of the bat star (Patiria miniata), a starfish found on the U.S. Pacific coast, by observing their activities (below) in seawater suffused with tiny beads that traced the flow of liquid.

Too many swirls can slow a larva down — the baby starfish adapts to the task at hand, creating fewer vortices while swimming and whipping up more of them when stopping to feed.

May 31, 2018 at 12:01 PM | Permalink | Comments (0)

Citizen Ex — "This is your Algorithmic Citizenship"

Screen Shot 2018-05-30 at 8.31.47 AM

"Where have you been online today? And what were your rights there? Download James Bridle's plug-in to discover your digital citizenship."









[via thespace]

May 31, 2018 at 10:01 AM | Permalink | Comments (0)

What is it?

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Hint: smaller than a bread box.

Another: not intended to be edible but you could eat it without damaging yourself (might not be all that tasty, though).

A third: made in the U.S.A.

May 31, 2018 at 08:01 AM | Permalink | Comments (4)

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