Early life on Earth: Lots of sex and no predators
Findings come from discovery of species of organism 540 million years old
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Jump to data The rise and fall of Earth's species
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Data: The rise and fall of Earth's species
Related: Science
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Five scientific tips for a tasty Memorial Day
Pools open and dusty grills come out of hiding this Memorial Day weekend, as we remember fallen war heroes and honor the living. To ensure your Memorial Day cookouts sizzle, rather than fall flat with dry burgers and pouty pals, here are some tips served up with a healthy side of science.
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Five scientific tips for a tasty Memorial Day
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