Metal-organic frameworks (MOFs) are a class of crystalline materials that consist of coordination bonds between transition-metal cations and multidentate organic linkers. The structure of MOFs is ...

Dear Annie: I love my friend, but she is late for everything. We have been close for 15 years, and she is kind, funny and loyal in a real crisis. But lunch at 12 means 12:30. Dinner at 7 means I am ...