The tree ferns are arborescent (tree-like) ferns that grow with a trunk elevating the fronds above ground level, making them trees. Many extant tree ferns are members of the order Cyatheales, to which belong the families Cyatheaceae (scaly tree ferns), Dicksoniaceae, Metaxyaceae, and Cibotiaceae. It is … [Read more...] about Tree fern
Afterimage
An afterimage is an image that continues to appear in the eyes after a period of exposure to the original image. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological afterimages. Afterimages occur because photochemical activity in the … [Read more...] about Afterimage
Crotalaria cunninghamii
Crotalaria cunninghamii, also known as green birdflower, birdflower ratulpo, parrot pea or regal birdflower, is a plant of the legume family Fabaceae,[1] named Crotalaria after the Greek word for rattle, because their seeds rattle, and cunninghamiiafter early 19th century botanist Allan Cunningham.[1][2]Crotalaria cunninghamii is known as Mangarr to the NyangumartaWarrarn … [Read more...] about Crotalaria cunninghamii
The white aurora – the Internet’s most successful aurora hoax
Every year about this time, I start seeing photos of an incredible white aurora. It’s hard to imagine how many million times these 3 photos have been posted, often as “The Hem of His Garment” Aurora Borealis in Finland, but they’ve also been posted as the aurora in the Yukon, in Alaska, etc. As you can tell by the title of this post, though, the photos don’t show the … [Read more...] about The white aurora – the Internet’s most successful aurora hoax
Trigeminal nerve
In neuroanatomy, the trigeminal nerve (lit. triplet nerve), also known as the fifth cranial nerve, cranial nerve V, or simply CN V, is a cranial nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the most complex of the cranial nerves. Its name (trigeminal, from Latin tri- 'three', and -geminus 'twin'[1]) derives from each of the … [Read more...] about Trigeminal nerve