Page 318 - If Darwin Had Known about DNA

Harun Yahya

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reach the retina at the back of the eye and, through a series of process-
es, are transformed into electric signals. These signals are transferred
along nerves to the brain's vision center. There, a colorful, bright and
three-dimensional world is perceived within the space of a few cubic
centimeters.
The same system applies to other senses as well. Cells on the sur-
face of the tongue transform chemical traces into electric signals that
become tastes. Odors are transformed into electric signals by cells in the
epithelium of the nose. Special sensors lodged beneath the skin trans-
form impulses of touch (such as the sensations of hardness or softness)
into electric signals, and a special mechanism in the ear does the same
with sound. All these signals are sent to appropriate centers in the

brain, where they are perceived.
To clarify the point, assume that you're drinking a glass of lem-
onade. The hard, cool surface of the glass you're holding is transformed
into electric signals by special receptors under your skin and sent to the
brain. Simultaneously, the smell of the lemonade, its taste, and yellow-
ish color all become signals that reach the brain. Likewise, the clink you
hear when the glass touches the table is perceived by the ear and trans-
mitted to the brain as an electric signal. All these perceptions are inter-
preted in the brain's relevant centers, which work harmoniously with
one another. As a cumulative result of these impulses, you sense that
you are drinking a glass of lemonade.
Concerning this important fact, consider the thoughts of B. Russell
and L. J. J. Wittgenstein, two famous philosophers:

For instance, whether a lemon truly exists or not and how it came to ex-
ist cannot be questioned and investigated. A lemon consists merely of a
taste sensed by the tongue, an odor sensed by the nose, a color and shape
sensed by the eye; and only these features of it can be subject to examina-
tion and assessment. Science can never know the physical world. 266
In other words, it is impossible for us to reach the physical world.