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Do the recycle numbers assigned to plastic containers indicate if they are
safe to use for heating food in a microwave oven?
Readers' Question
 Readers contributed to December's walking geese
question. Here's your next question:
Can a domestic cat be trained as well as a dog? Because, I've tried to train mine
with not much success... Vicky, Maracaibo,
Venezuela
Deadline: 22 Feb. We will publish the best
answers on 8 March.
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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