Four BBC science news stories

I forgot how cool the BBC News Science/Nature section can be. Four stories in the past day caught my eye, two historical, two astronomical.

Early humans followed the coast - Learning how to live off the sea may have played a key role in the expansion of early humans around the globe.

Aztec ruins unearthed in Mexico - Archaeologists working in Mexico City have discovered an Aztec monolith, the most important ruins of the ancient civilisation to be found in decades.

Mars orbiter looks down on rover - Nasa's new orbiter at Mars has taken a spectacular picture of the Opportunity rover sitting on a crater's rim.

Astronomers complete mighty map - Astronomers have produced their biggest 3D map yet of the "local" Universe.