Poor sleep linked to toxic buildup of Alzheimer’s protein, memory loss
Credit: Photo courtesy of Bryce Mander and Matthew Walker
Date:June 1, 2015
Source:University of California – Berkeley
Summary:Sleep may be a missing piece of the Alzheimer’s puzzle. The toxic protein that is the hallmark of Alzheimer’s disease blocks the deepest stages of sleep, resulting in memory decline, according to new research.
A small vortex on the wing makes the elegance of birds’ flight
The alula feathers, the thumb-like structure, on both wings are well visible. Credit: Keith Bannister
One mystery of birds’ flight is solved! The elegance of birds’ flight, their seemingly effortless aerial turns and the softness of their landing, have been envied by many people. From countless observations, it has been known that the birds use a small group of feathers, called “the alula”, a thumb-like structure that is present at the bend of the wing, in slow and steep flight such as landing. Why do they use it? How the tiny feathers can help them land softly?