"The man who is swimming against the stream knows the strength of it."
[Woodrow Wilson]

Quote of the Day, from brainyquote.com (2019/03/24)

Article of the Day

Hedgehog mushroom

Hydnum repandum, the hedgehog mushroom, is a fungus of the family Hydnaceae. First described by Carl Linnaeus in 1753, it is the type species of its genus. The cap is dry, colored yellow to light orange to brown, and often develops an irregular shape, especially when crowded. The mushrooms are characterized by spore-bearing structures—in the form of spines rather than gills—which hang down from the underside of the cap. The mushroom tissue is white with a pleasant odor and a spicy or bitter taste. All parts of the mushroom stain orange with age or when bruised. A mycorrhizal fungus, H. repandum is broadly distributed in Europe, Asia and western North America, where it fruits singly or in close groups in coniferous or deciduous woodland. This is a choice edible species, although mature specimens can develop a bitter taste. The mushrooms are sold in local markets of Europe and Canada. (Full article...)

  • Article of the Day

Image of the Day

Freistadt Pfarrkirche Nothelferaltar 01.jpg
Source: Wikimedia Commons.

On this day: March 24

March 24: World Tuberculosis Day

M. tuberculosis cells
M. tuberculosis cells

Elizabeth Ridgeway (d. 1684) · Lorna Hodgkinson (d. 1951) · Jessica Chastain (b. 1977)

Knowledge about Earth

Facts and Figures

  • Age of Earth: ~ 4.568 billion years
  • World Population: 7.3 billion (July 2015)
  • Continents: 7 (Asia, Africa, North America, South America, Antarctica, Europe, and Australia)
  • Mean Radius: 6371.0 km
  • Axial Tilt: 23,44°

Image Source: Wikipedia - License: Public Domain (thanks to NASA)

Our Solar System

Our solar system consists of
1 star (Sun) and 8 planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).

  • 1 AU (astronomical unit) is roughly the distance between Earth and the Sun (about 150 million kilometres).
  • The space probe Voyager 1 was launched by the NASA in 1977 and is meanwhile (autumn 2015) about 133 AU away from Earth.

Image Source: Wikipedia - License: CC BY-SA 3.0

Why you should extend your general knowledge:

There are many reasons why one should or wants to extend his knowledge.
First you should consider that "general knowledge" is knowledge which a group of humans - who belong together regional, temporal or otherwise - owns. Thus, it describes a basic understanding of specific categories of knowledge.

As the English philosopher Francis Bacon said before: "Wisdom is Power" [Bacon 1597].