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The Indispensables: Problem solvers, shelf stockers, bench scientists, record keepers, machine fixers, weekend warriors, den mothers, old hands, fresh eyes, mentors, managers. Every research lab has behind-the-scenes specialists without whom modern science could not get done. Also in this issue:

• Avant Garde Scientist: With an outsider's perspective, Leslie Vosshall has changed thinking about the meaning of olfaction—for humans and insects;
• The Fat You Can't See: In growing numbers of people, the liver holds a hidden, dangerous store of fat. Finding the triggers is step one;
• The View From Here: Unbounded Creativity—and powerful computers—make possible the latest devices designed to peer into the deepest recesses of organs and cells.