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 What makes us tick? When we sleep on a bus trip, why
are we often able to wake up just before our intended stop?
Readers' Question
Readers
contributed to November's bio-clock question. Here's your next question:
Why do geese walk across a road
when they can fly, thereby not getting hit by a car?
Deadline: 28 Dec. We will publish
the best answers on11 Jan.
You get the credit. Click here to give April your answer:
Answer the question.
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 Mystery
Picture: The Sun's magnetic field
Is that our Sun? The unusual banana-shaped loops shown above are actually
part of a computer-generated snap-shot of our
Sun's magnetic
field.
Magnetic field lines loop through the solar atmosphere and
interior to form a complicated web of magnetic structures. Many of these
structures are visible in the chromosphere and corona, the outermost layers of
the Sun's atmosphere. Surfaces of constant
magnetic field
strength (like the "bananas") loop through the
Sun's corona, break
through the Sun's surface, and connect regions of magnetic activity such as
sunspots.
Image Credit: A. Gary
et al. (NASA/MSFC),
NASA
Past mystery pictures:
 Isaac Newton
 The
Sahara Desert
 F/A-18
Hornet breaks the sound barrier
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