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The Case of Barnacle Bill We learned a lot about Mars from one instrument and one rock.

Chips Off the Old Block The stone-age technology of flint knapping is alive and well.

Government Funds Attack on Earth's Crust EarthScope will create the world's largest instrument.

Gravimetry New-generation gravity meters can sense your body's attraction.

Helioseismology Solar studies tell Earth scientists some important things.

High-Pressure Experiments Squeezing data from stones with the diamond-anvil cell.

A Hubble Telescope Into Earth The USArray seismic network will carpet the continent.

An Incisive Study An elegant experiment reveals how streams cut bedrock.

Length-of-Day Studies Space-based geodesy sheds light on the deep Earth.

Looking Deep Into Glaciers New tools let us see inside, even underneath glaciers.

Mapping Deep Time Fossils are our first guide through the millions of years.

Mapping the Past Picturing a land we've never seen takes fancy brainwork.

Measuring the Big One What quake is biggest depends on your instrument.

Nannobacteria: A Bunch of Rot A simple experiment overturns an irksome theory.

A New Look in the Horse's Mouth Better tools pull new data from fossil teeth.

Pinning Down Carbon Stonehenge-like setups test greenhouse atmospheres in open air.

Radiocarbon Radiocarbon and other isotopic tools are forged in outer space.

Recipes for Volcanoes Cooking up a realistic volcano is not child's play.

Remote Sensing Like riding a Ferris wheel, we go to space to look back down.

Rhenium-Osmium Studies Deep planetary information comes from two rare metals.

Seismic Ears for Nuclear Peace Seismic networks help detect bomb tests.

Seismic Tomography How we take "ultrasound baby pictures" of the mantle.

Slicing Things Thin Microscopic thin sections bring out the best in minerals.

Space Cameras Space images have forged a new Earth science: planetology.

Strange Seismometers No seismograph? A standing stone or shopping carts will do.

Taking the Stress Test Distant mountain-building warps microscopic calcite grains.

Tools of the Trade The geologist's simple tools endure—and the trained eye.

The Wired Seafloor We're networking the ocean floor with smart sensors.

Zircon Studies Close work in the petrographic lab pays off in a grand way.

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