Beach sand ripples can be fingerprints for ancient weather conditions
Experiments show shifting ripple patterns can signal times of environmental flux.
Tsunami sweeps away homes as power earthquakes rock Indonesia
Powerful earthquakes jolted the Indonesian island of Sulawesi on Friday and a triggered a tsunami that an official said swept away houses. Indonesia had declared a tsunami warning after the strongest quake, which registered magnitude 7.5, but lifted it about half an hour later