Fleas are perfectly designed by
nature to feast on anything containing blood. Like a shark in the water or a
wolf in the woods, fleas are ideally equipped to do what they do, making them
very difficult to defeat. The bodies of these tiny parasites are extremely
hardy and well-suited for their job.
A flea has a very hard exoskeleton,
which means the body is covered by a tough, tile-like plate called a sclerite.
Because of these plates, fleas are almost impossible to squish. The
exoskeletons of fleas are also waterproof of fleas are also waterproof and shock
resistant, and therefore fleas are highly resistant to the sprays and chemicals
used to kill them.
Little spines are attached to his
plate. The spine the flea scurries through an animal’s fur in – search of
grooming pet tries to pull a flea off through the hair coat, these spines will
extend and stick to the fur like Velcro.
Fleas are some of the best jumpers
in the natural world. A flea can jump seven inches, or 150 times its own
length, either vertically or horizontally. An equivalent jump for a person
would be 555 feet, the height of the Washington Monument. Fleas can jump 30,000
times in a row without stopping, and they are able to accelerate through the
air at an incredibly high rate – a rate which is over ten times what humans can
withstand in an airplane.
Fleas have very long rear legs with
huge thigh muscles and multiple joints. When they get ready to jump. They fold their
long legs up and crouch like a runner on a staring block. Several of their
joints contain a protein called resilin, which helps catapult fleas into the
air as they jump, similar to the way a rubber band provides momentum to a
slingshot. Outward facing claws on the bottom of their legs grip anything they
touch when they land.
The adult female flea mates after
her first blood meal and begins producing eggs in just 1 to 2 days. One flea
can lay up to 50 eggs in one day and over 2,000 in her lifetime. Flea eggs can
be seen with the naked eye, but they are about the size of a grain of salt. Shortly
after being laid, the eggs begin to transform into cocoons. In the cocoon
state, fleas are fully developed adults, and will hatch immediately if
conditions are favorable. Fleas can detect warmth, movement, and carbon dioxide
in exhaled breath, and these three factors stimulate them to emerge as new
adults. If the flea does not detect appropriate conditions, it can remain
dormant in the cocoon state for extended periods. Under ideal conditions, the
entire life cycle may only take 3 weeks, so in no time at all, pets and homes
can become infested.
Because of these characteristics,
fleas are intimidating opponents. The best way to control fleas, therefore, is
to take steps to prevent an infestation from ever occurring.
Fleas are difficult to squish
because they have
I Sclerites
II Tough spines
III Resilin in their joints
I am writing in response to response
to the article “Protecting our public spaces” in issue 14, published this
spring in it, the author claims that “all graffiti is public spaces.” I would
like to point out that many people believe that graffiti is an art from that
can benefit our public spaces just as much as sculpture, fountains, or other,
more accepted art forms.
People who object to graffiti
usually do so more because of where it is, not what it is. They argue, as your
author does, that posting graffiti in public places constitutes an illegal act
of property damage. But the location of such graffiti should not prevent the
images themselves from being considered genuine art.
I would argue that graffiti is the
ultimate public art form. Spray paint is a medium unlike any other. Though
graffiti, the entire world has become a canvas. No one has to pay admission or
travel to a museum to see this kind of art. The artists usually do not receive
payment for their efforts. These works of art dotting the urban landscape are
available, free of charge, to everyone who passes by.
To be clear, I do not consider
random words or names sprayed on stop signs to be art. Plenty of graffiti is
just vandalism, pure and simple. However, there is also graffiti that is
breathtaking in its intricate detail, its realism, or its creativity. It takes
great talent to create such involved designs with spray paint.
Are these creators not artists
just because they use a can of spray paint instead of a paintbrush, or because they
cover the side of a building rather than a canvas?
To declare that all graffiti is
vandalism, and nothing more, is an overly simplistic statement that I find out
of place in such a thoughtful publication as your magazine. Furthermore,
graffiti is not going anywhere, so might as well find a way to live with it and
enjoy its benefits. One option could be to make a percentage of public space,
such as walls or benches in parks, open to graffiti artists. By doing this, the
public might feel like part owners of these works of art, rather than just the
victims of a crime.
In paragraph 4, the writer states,
“Plenty of graffiti is just vandalism, pure and simple.” He most likely makes
this statement in order to