With more than 80% of ocean species wiped out, the end-Permian event was the worst mass extinction of all time. But the ...

If we account for all reactants and products in a chemical reaction, the total mass will be the same at ... as coal before being burned in a power plant, followed by two decades in Earth's ...

But these databases include information on today's plants, not on extinct species. "We examined all the DNA fragments from our cores and then used statistical models to filter out those with ...