Science, March 13, 2009

Cover
False-color scanning electron micrograph of
oriented vaterite, a crystalline polymorph of calcium carbonate, formed
through template-controlled nucleation. Formation starts with the
aggregation of prenucleation clusters forming an amorphous phase from
which the crystals develop at the template surface. This experimental
process may be analogous to the natural formation of seashells and
other marine skeletons.

How Much Coal Remains?
The planet's vast store of
coal could fuel the world economy for centuries -- and fiercely stoke
global warming -- but a few analysts are raising the prospect of an
imminent shortfall.

A Memorable Device
Wearable cameras offer help to
people with memory problems and provide a tool for studying how the
brain creates and retrieves personal histories.

Fathoming Matter's Heart Unbound
Going to extremes, physicists hunt for "unbound" nuclei that don't stick together at all.

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