Vital
Element
Water is life. A truth so basic
that it is commonplace. Concern about the scarcity
of this ''vital element'' is widespread, as many people
believe that water will be the detonator of future
wars.
These concerns also inundate
the Internet. It is not by accident, of course. We
already know that life itself originated in water,
that water covers three-fourths of the Earth's
surface, and that 80 percent of our
bodies is simply water.
But the problem with freshwater
is perfectly easy to understand: 97.5 percent of the
water on Earth is salty, and three-fourths of the
remaining 2.5 percent are frozen around the North
and South Poles. What is left is just 0.01 percent
of this precious resource.
Even so, there is the broad impression
that this is enough to supply a very large population.
But the truth is that freshwater is not well distributed
throughout the world, and in many places it is threatened
by problems of contamination, squandering and poor
infrastructure, as occurs with the dams that affect
the basins of some major
rivers.
The standpoint of water scarcity
has generated a global mobilization, which has as
its axis the United
Nations. During the first Earth Summit, in Rio
de Janeiro in 1992, freshwater comprised an entire
chapter in the program of action known as Agenda
21. World
Water Day is now an annual event, and currently
the UN is preparing a global
report on the availability of this life-giving
resource.
UNEP:
Freshwater - Resources - Agenda 21
UNESCO:
World Water Day
Agenda
21: Chapter 18 on Water
The
world's largest rivers
24
UN agencies prepare a global report on water
A
Prodigious Crop
Corn is planted and harvested
in nearly all the Earth's farmland that is suitable
for agriculture. But it was not always so. Until 500
years ago, its use was limited to what we now know
as the Americas, from Chile to Canada.
Its global popularity began
when the first Europeans learned of its existence.
The explorers spoke of ''a kind of grain, called 'maize,'
that tastes good cooked, dried or ground into flour''.
The cultivation of this
plant, from the 'gramineae' family, originated
thousands of years ago in the area that is now Mexico
and Central America. The oldest vestiges of corn production
found in the region are some 7,000 years old. It is
here that the word ''maize'' was born, meaning ''sustenance
of life''.
Corn served as the basis of the
diet, and even the culture, of the ancient civilizations
of the Americas.
Across the Western Hemisphere,
it is known by different names: corn, maíz, choclo,
jojoto, milho, and elote, for example. There are six
basic types of corn: dentate, hard, soft (or grainy),
sweet, popcorn and sheathed.
Beyond its virtues as a food
(where it demonstrates an incredibly capacity to transform
itself into flour, pasta, etc.) maize holds other
surprises: it is used as the basic ingredient for
some industrial processes, such as the production
of starch, oil, protein, alcoholic beverages, sweeteners,
and fuels.
Reflecting its importance for
humanity, the Internet holds seemingly infinite references
to corn. There are hundreds of recipes from a wide
range of cultures, and numerous
sites that explain its uses, or inform us of its
basic characteristics.
And if you combine the word ''corn''
or ''maize'' with the term ''transgenic'' in just
about any Internet search engine, you'll enter one
of the hot debates of today: whether humanity should
be producing genetically modified corn, as the consequences
for the environment and human health are still relatively
unknown.
FAO:
Maize in Human Nutrition
The
Maize Page
Maize
Cooperation in Genetics
CornCam:
Watch Corn Grow!
Life
of a Coleopteron
Beetles inhabit nearly the entire
planet. They have one important thing in common: the
hard wing shell that gives them their armored appearance.
But beyond that, beetles are one of the most diverse
families that exist. One other thing they share is
their ''official'' name: they belong to the order
''coleoptera.''
''The beetles are the largest
order including more species known to science than
any other order not only in the Class of Insecta,
but also in the entire animal kingdom (Animalia)...
beetles constitute more than a quarter of all known
animals,'' reports a website based in St.
Petersburg.
Since ancient times beetles have
formed a part of human culture. People have studied
them and copied them in forming mythology, adornments
and even fairytales. Even old Aesop
used them in his fables.
Some beetles are famous for their
incandescent colors, others for the extraordinary
designs that adorn their wings. Some stand out
because of their strength, and others due to their
ability to survive, often for years, in the most adverse
conditions.
One Internet site affirms there
are 140 to 173 different species. Their diversity
is evident, for example, in size: there are some that
measure just 25 millimeters and others that reach
more than 10 centimeters.
Their omnipresence on Earth even
includes the Internet, where beetles are the stars
of digital
games, or simply the theme of unassuming directories.
Beetles
and coleopterists
Coleoptera
site
Aesop's
Fables: The eagle, the hare and the beetle
Digital
games, 3-D, etc.
Coleoptera,
info and photos
Beetles
illustrated
Directory
of beetle sites
The
Bug Page: Beetles
Armored
Mammals
To find this unique animal on
the Internet, try using some of the different names
people have given them: armadillo, mulita, quirquincho,
tatú, cachicamo. These words are used in different
countries and regions to describe one of the strangest
inhabitants of the Americas: an armored mammal.
From the scientific point of
view, it has another designation: it forms part of
the Edentata order and the Dasypodidae
family. There are more than 20 different armadillo
species living at different latitudes of North and
South America, and exhibiting different habits, though
all share the characteristic shell, which is made
of a bone and horn.
Armadillos or quirquinchos inhabited
South America some 50 million years ago. There are
numerous fossil remains that indicate their presence,
as well as their now-extinct relatives, like the glyptodont.
The animal's strange appearance amazed the first Europeans
who saw them, but the armadillo had by then had already
enriched the knowledge of indigenous peoples.
This mammal is somewhat elusive.
But it is easy to detect them in our culture: in tales
and legends from places such as Peru,
Mexico
and Bolivia.
The shell of the quirquincho has been used to create
the 'charango,'
a stringed instrument originating in Bolivia. And
in some areas, this species is considered a delicious
main dish.
Today, different armadillo species
can be found from southern Chile to the lower half
of the United States. Their presence in North America
dates back to the mid-1800s, and in some places, such
as Texas, they are so abundant that many people consider
them a plague.
But in other regions there are
armadillo species that are on the verge of extinction,
whether from over-hunting or from the destruction
of their habitat. That is the problem facing the giant
armadillo of Brazil.
Armadillo
Online
The
World of the Armadillo
Armadillos
invade the United States
Armadillos
in Texas
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