Martian 'blueberry' stones may hold evidence of the planet's watery past, a new study of similar minerals on Earth suggests.
Wally has been stirring up mischief by lounging on lifeboat slipways and capsizing passing dinghies, but conservation groups have warned tourists not to get too close.
Scientists analyzed the hearts of retired astronaut Scott Kelly after he spent time in space and elite endurance swimmer Benoît Lecomte after he swam the Pacific Ocean.
Scientists have identified the 19th form of water ice. The exotic, four-sided crystals of this rare ice variety, now dubbed ice XIX, form at ultra-low temperatures and ultra-high pressures.
Separate shark attacks in Hawaii and the eastern Caribbean leave two people dead. Experts say tragedies like this are rare relative to the number of people in the water.
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