Tiny fossils have helped scientists crack a Cretaceous cold case. Using chemical signals preserved in microscopic shells, Northwestern University researchers found strong evidence that ocean acidification helped trigger one of the biggest extinction events in the history of planktic foraminifera, small shell-building organisms that are essential to Earth’s carbon cycle.The extinction happened around 113 million…

After ending last week on a strong note, stock market is headed for a crucial week with a host of domestic and global events set to shape investor sentiment. Reserve Bank of India’s interest rate decision, ongoing US-Iran conflict, crude oil prices and a fresh round of quarterly earnings will be among the key factors…