By Amy McDermott for the Proceedings of the National Academy of Sciences. Broadcast version by Suzanne Potter for California News Service reporting for the Pulitzer Center-Public News Service ...

"We can see what the clams graze on over a period of time and then we can back calculate how that will affect the populations ... in the tiny critters in Lake Karaapiro, as well as the chemistry of ...

Most forms of income count as taxable — but not all. Here’s how to calculate yours and some ways to reduce your liability. Many, or all, of the products featured on this page are from our advertising ...

To calculate your average trade price, add all purchase prices and divide by the number of trades. Use weighted average trade price calculation if share quantities vary per purchase. Weighted averages ...

The history of human progress is, in many ways, the history of technology’s diffusion. Among these advances, a few—what economists call general-purpose technologies—have had the greatest impact on ...