Drop-down lists in an Excel sheet can greatly facilitate data entry. Here's a look at how to use Microsoft Excel's data validation feature to create handy lists within your worksheets.

Make a list for the days of the week, entering "Monday" through "Sunday" in seven different cells across a row or down a column.

How Groups of Cells Cooperate to Build Organs and Organisms Understanding biology’s software—the rules that enable great plasticity in how cell collectives generate reliable anatomies—is key to ...

Already the project has revealed a previously unknown type of cell in the windpipe that might play a role in cystic fibrosis — and lead to a new treatment, scientists say.