1 - Sexologists claim the inside of the knee is a prime erotic area and acupuncturists confirm a cluster of sexual points there.

2 - After a week of contentious public and private debate, a small cluster of astronomers voted to demote Pluto from its planetary status.

3 - After a week of contentious public and private debate, a small cluster of astronomers has voted to demote Pluto from its planetary status.

4 - The Romans were descended from a cluster of peoples who had crossed the Alps into Italy during the second millennium B.C. and spoke a variety of Indo-European dialects.

5 - A nasal spray is safe and effective at rapidly treating cluster headaches, which are considered to be the most painful kind of headache with few treatment options.