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Episode 1027 · Sep 28, 2003 · 2h 50m

September 28, 2003: Nanotechnology - Douglas Mulhall

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    Nanotech 101chemistry, not tweezers: Mulhall defines nanotechnology as manipulating matter at the billionth-of-a-meter scale and explains that today's real progress comes through chemistry, not the IBM-style scanning-tunneling pickup of single atoms.

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    Nanobacteria - a third kind of life?Mulhall walks through the Scripps researcher who discovered nanobacteria - particles smaller than viruses, with a single DNA-like strand, now linked to heart disease and challenging the definition of life.

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    Gray goo explainedArt asks Mulhall to define gray goo. Mulhall describes a self-replicating nanomachine that treats carbon-based life as raw material, and Art summarizes how it would consume dirt, rocks, houses, people - everything in its path.

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    Why ecosystems may save usMulhall counters the gray goo scenario with the argument that for every runaway monster nature evolves a counterbalance, citing Ray Kurzweil's view that technology is evolution by other means and will develop its own ecology.

Art Bell reports on breaking news including Italy's nationwide blackout blamed on a single fallen tree, the fracturing of the Arctic's Ward Hunt ice shelf, and a remarkable quote from Defense Secretary William Cohen about electromagnetic weapons capable of altering climate and triggering earthquakes remotely. Australia's worsening drought linked to ozone depletion and a shrinking polar vortex also draws attention.

Author Douglas Mulhall joins from the Bahamas to explain how nanotechnology is already transforming everyday life through stain-resistant fabrics, longer-lasting tennis balls, and invisible zinc oxide sunscreens. He describes how carbon nanotubes, with 30 times the tensile strength of steel, have made a space elevator feasible at a fraction of current launch costs. Mulhall reveals that manufactured diamonds indistinguishable from mined stones are now being produced cheaply, promising computing speeds 100 times faster than silicon processors.

The conversation turns to nanomedicine, where gold nanotubes coated with antibodies already perform rapid blood diagnostics. Mulhall discusses the discovery of nanobacteria, a mysterious pathogen smaller than any known bacterium that forms calcium shells and may trigger heart disease, and explains how existing drugs like tetracycline can destroy it.

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