Grocery stores add tech features to stay competitive

Like many grocery shoppers, Michele Ricketts dreads long checkout lines. But lately, she's been breezing by the cash register at her neighborhood Ralphs even with the usual crowds at the store.

Solar cells made from black silicon

Solar cells convert three-quarters of the energy contained in the Sun's spectrum into electricity – yet the infrared spectrum is entirely lost in standard solar cells. In contrast, black silicon solar cells are specifically ...

Fireworks in the early universe

Galaxies in the early universe grew fast by rapidly making new stars. Such prodigious star formation episodes, characterized by the intense radiation of the newborn stars, were often accompanied by fireworks in the form of ...

page 6 from 7