Flipping Magnetic Fields
North and south. We take these directions for granted. Pull out a compass and the needle will swing to the north in response to the magnetism in the Earth's crust. The magnetic poles roughly coincide with the axis of the Earth's rotation. But some scientists…
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Astronomy
Mixed Up In Space
Imagine waking up in space. Groggy from sleep, you wonder ... which way is up? And where are my arms and legs?…
Astronomy
Powerful Quasars
Quasars appear as distant, highly luminous objects that look like stars. Strong evidence now exists that a…
Geology
1816 - The Year Without A Summer
Most global temperature change occurs over a long period of time, centuries rather than years, and in small…
Medicine
What Is A Cerebral Aneurysm?
A cerebral aneurysm is the dilation, bulging or ballooning out of part of the wall of a vein or artery in the…