Insects in the cricket family Tettigoniidae are commonly called katydids or bush crickets. More than 6,400 species are known. They are also known as long-horned grasshoppers, to distinguish them from the Caelifera, the true or short-horned grasshoppers. Part of the suborder Ensifera, it is the only family in the superfamily Tettigonioidea.

Primarily nocturnal in habit, with strident mating calls, many katydids exhibit mimicry and camouflage, commonly with shapes and colors similar to leaves.[2]


Webcam Collections

Explore.org: A selection of high-quality live cameras

Bird webcams from Avibase

Bird webcams from the RSPB

WildEarth: a selection of wildlife and safari cameras. Backup site

Animal Planet Live: a collection of live cameras of captive animals 

Safari cameras from Africam.com

EarthCam collection

Mangolink: Collection organised by animal groups

World Land Trust cameras

Zoos and Aquariums

Edinburgh zoo (4)

Vancouver Aquarium (5)

Monterey Bay Aquarium (8)

San Diego zoo (4)

Houston zoo (9)

SeaWorld and Busch Gardens

Chester zoo (4)

Woodland Park zoo (3)

Dublin zoo (4)

the paradox of confirmation

Epistemology: The Paradox of the Ravens

Published on Jul 24, 2015
In this video, Marc Lange (UNC-Chapel Hill) introduces the paradox of confirmation, one that arises from instance confirmation, the equivalence condition, and common inference rules of logic.

This was solved by Popper: You don’t look for confirming evidence. You look for DIS-confirming evidence, and hold your hypothesis tentatively.The use of the word “confirmation” is what’s not sound. Sure, you can apply the evidence; your chair without ballet shoes does indeed lend evidence that all ravens wear ballet shoes. See, that one piece of evidence is in support of all ravens being black, but it isn’t enough evidence to completely confirm it. now if you find every non-black thing and there isn’t a single raven among them: you’ll know that every raven is black.

Sankey diagrams

Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity.

Sankey diagrams are typically used to visualize energy or material or cost transfers between processes. They can also visualize the energy accounts, material flow accounts on a regional or national level, and also the breakdown of cost of item or services.[1]

Sankey diagrams put a visual emphasis on the major transfers or flows within a system. They are helpful in locating dominant contributions to an overall flow. Often, Sankey diagrams show conserved quantities within defined system boundaries.