For almost 60 years, scientists have tried to understand why DNA doesn't replicate wildly and uncontrollably every time a cell divides, which happens constantly. Without this process, we would die.

For almost 60 years, scientists have tried to understand why DNA doesn’t replicate wildly and uncontrollably every time a cell divides – which they need to do constantly. Without this process, we ...

If you need to move text, an image or another object from one part of a document to another, or from one app to another, you need to use copy (or cut) and paste. On a Mac or MacBook, the keyboard ...