We're off to the ocean! This week our focus is on waves. A physics teacher and enthusiastic surfer explains how waves form. Plus: why is the sound of waves so relaxing? But waves can also be destructive: can rogue waves be predicted?
Ceremonies have been held in Indonesia, Thailand, India, Sri Lanka and elsewhere for the victims of one of history's deadliest disasters. More than 230,000 people were killed across a string of Indian Ocean nations.
Australia's dry and hot weather, coupled with ocean heat waves, could last for months. Meteorologists' forecasts don't bode well for battling bushfires across Australia.
As sea levels rise, the planet's natural bulwarks against the ocean could help protect the coastline. But these very habitats are also under threat.
About 1 million common murres died during a 2015-16 heat wave, scientists have said. Researchers believe that a disrupted food supply led to the mass die-off of the North Pacific seabirds.
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