Tell me why : Part 2 | Engage Learning Magazine

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Tell Me Why?
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Why we see a blue sky in the day and black at
night?
To us, from earth, when we look at the sun, it
appears as yellow, however, the colour of the sun
is white. The light emitted by it is also
white, when sunlight enters the earths atmosphere
we see the light as yellow due to the scattering
of light. White light is nothing but a result of
the combination of the following colours of
different wave lengths violet, indigo, blue,
green, yellow, orange and red. As mentioned
earlier, sunlight scatters when it enters the
earths atmosphere, this is because it collides
with the air particles in the atmosphere. As we
know that all colours have a different wave
length. Colours with a shorter wavelength usually
scatter more on collision as compared to colours
with a longer wavelength. As a result, violet
light is scattered the most. However, violet is a
colour that the human eyes do not see very well.
Blue after violet light is the most scattered
light. Human eyes being very sensitive to the
colour blue, easily see the colour and therefore
we see a blue sky.
The light that the moon reflects is not as
powerful as actual sunlight. It is the
overpowering, extremely strong nature of sunlight
that conceals outer space. The sunlight that is
reflected by the moon is not as powerful as
direct sunlight, therefore not leading to
scattered light reach the eyes of the observer.
Outer space is black in colour with its
planets, moon and stars, which is visible to us
in lack of sunlight at night changing the colour
of the blue sky to black.
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The Human Body
Why holding your breath helps you stop
hiccups? Some theories propose that the hiccup
is an evolutionary remnant of earlier amphibian
respiration and in the process evolution and
growth, it is an antecedent to modern lung
respiration. When our diaphragm muscle
involuntarily contracts, the human body tries to
take a quick breath which is suddenly stopped by
the epiglottis with the vocal cords snapping shut
to check the inflow of air. This snapping is
what makes the hiccup sound.  Phrenic nerves
serve the diaphragm muscle. Irritation of these
nerve that stretches from the neck to the chest
can also cause hiccups. When you hold your
breath, you build up carbon- di-oxide in your
body that helps in stopping the diaphragm from
spasming and in turn stops hiccups.
Why do we have eyebrows? Though during the
process of evolution human body hair reduced,
however, eyelashes and eyebrows remained.   This
is because our eyebrows serve a purpose. They
help us get a clear vision by preventing water,
sweat and debris from falling into your eye
socket. The shape and direction of the eyebrow
hair channelizes the moisture to flow sideways
around the eyes, along the side of the head. They
also help to block out light and filter dust and
dirt that may fall into the eyes. Over a period
of time, eyebrows have also begun to play a key
role in the process of human communication.
Eyebrows help in expressing happiness, anger, as
well as surprise. Research also suggests that
eyebrows may be a more recognizable indicator of
identity.
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