TEKNIKElon Musk berättar om hur ett underjordiskt tunnelsystem för snabbtransport av bilar ska minska den överjordiska trafiken i ett överbelastat Los Angeles.

CULTURETED.com: In the center of Caracas, Venezuela, stands the 45-story "Tower of David," an unfinished, abandoned skyscraper. But about eight years ago, people started moving

VETENSKAPTED.COM: "After due diligence, including a survey of published scientific research and recommendations from our Science Board and our community, we have decided that Graham

VETENSKAPTuna are ocean athletes - fast, far-ranging predators whose habits we're just beginning to understand. Marine biologist Barbara Block fits tuna with tracking transponder tags that record data.