Please register ( or log-in ) to create and edit pages

User Tools

    Please register ( or log-in ) to create and edit pages
  • Register

Site Tools


Main Menu

Main menu
[ Click categories to expand ]

Other categories

For tests only


Also see:

Content Guidelinesplugin-autotooltip__plain plugin-autotooltip_bigContent guidelines

Ideas for new topics are always welcomed, from experts and non-experts alike - if you're not sure if they'll be accepted by other editors, put them in the 'Proposed content' section for approval. The easiest way to create a new page is to use the

Registrationplugin-autotooltip__plain plugin-autotooltip_bigRegistration

At present, only registered users can create and edit articles. The registration process is very straightforward. Just click the 'Register' link at the top right of any page.

After you've registered, you'll be able to login with your password at any time…

How to edit pagesplugin-autotooltip__plain plugin-autotooltip_bigEditing pages

Once you're logged in, a grey floating 'Tool' menu at the right hand side of the screen enables access to all the main 'Content Pages' for editing. (Note: Some pages, such as the site info etc. are locked)

Like most Wikis, the site doesn't use

Importance Ratingsplugin-autotooltip__plain plugin-autotooltip_bigImportance ratings

In a departure from the usual Wiki format, Wikenigma assigns 'Importance Ratings' to some pages.

The idea is to separate articles which are considered (by the editors) to cover exceptionally important unknown issues from those which (although also u…

Faqplugin-autotooltip__plain plugin-autotooltip_bigFrequently Asked Questions

Q. Why the weird syntax? A. Like most Wikis, the site doesn't use HTML for formatting (security reasons etc). A guide to the special syntax can be found here. Unfortunately it can be quite confusing at first - but there's now a new 'Visual …

Newsplugin-autotooltip__plain plugin-autotooltip_bigNews

[ newest at the top ]

• Oct 2020 : A milestone of 500 unknown articles has been reached.

• Aug 2020 : Currently (beta) testing the new 'WYSIWYG' (What You See Is What You Get) page editor. It greatly simplifies the editing process, avoiding the need to learn th…

Contactsplugin-autotooltip__plain plugin-autotooltip_bigContacts

Use this form to send a message to Wikenigma . . . [ * note: all fields must be completed ]

Legalplugin-autotooltip__plain plugin-autotooltip_bigLegal

Content in general

Please note that in common with other publicly editable wikis, this website is not responsible for content posted by the public. Nevertheless, the ongoing editing process should be able to remove unsuitable content in a reasonable time. If you…


538 unknowns listed

Wikenigma supports:

plugin-autotooltip__plain plugin-autotooltip_bigDonate to Wikenigma . . .

The best way to donate is by adding new original content !

That can either be by contributing to an existing article, or by creating a new page with an as-yet-unlisted 'Known Unknown'.

Any registered user can create content.

A-Z listing
rss / xml feed
sitemap file

Wikenigma - an Encyclopaedia of Unknowns Wikenigma - an Encyclopaedia of the Unknown Science

Magnetoreception

A considerable number of animals, including bacteria, arthropods, molluscs and mammals are known to be able to sense magnetic fields.

For some varieties of bacteria, known as Magnetotactic bacteria, the ability is now quite well explained. But for mammals and birds, for example, there are currently no agreed explanations.

“The largest issue affecting verification of an animal magnetic sense is that despite more than 40 years of work on magnetoreception there has yet to be an identification of a sensory receptor. Given that the entire receptor system could likely fit in a one-millimeter cube and have a magnetic content of less than one ppm, it is difficult to discern the parts of the brain where this information is processed.”

See Magnetoreception at Wikipedia.

Recent experiments on human magnetoreception

Although there have been a large number of controlled studies intended to determine (or refute) the existence of magnetoreception in humans, the results have not been conclusive.

A 2019 study from Caltech and the University of Tokyo, however, appears to show marked differences in measurements of human brain Alpha wavesplugin-autotooltip__plain plugin-autotooltip_bigElectroencephalography

Electroencephalography (EEG) is an electrophysiological non-invasive monitoring method to record electrical activity of the brain. Characteristic waveforms - e.g. the so-called Alpha-rhythm (sinusoidal-like waves with frequencies in 8–15 Hz range…
in differing geomagnetic fields. It's important to note that the experimental subjects were not necessarily aware of the changes. See Transduction of the Geomagnetic Field as Evidenced from alpha-Band Activity in the Human Brain.

The report paper on the research ends :
Given the known presence of highly-evolved geomagnetic navigation systems in species across the animal kingdom, it is perhaps not surprising that we might retain at least some functioning neural components especially given the nomadic hunter/gatherer lifestyle of our not-too-distant ancestors. The full extent of this inheritance remains to be discovered.

Also see: Pigeon navigationplugin-autotooltip__plain plugin-autotooltip_bigPigeon navigation

Homing pigeons can very reliably find their way back to their adopted roosting place - even when they have been physically removed hundreds of kilometres - (and often without any knowledge of the route).

It's known that they use a variety of methods …


    Share this page :


DOKUWIKI IMPLEMENTATION DESIGN BY UNIV.ORG.UK