1.   His experiment showed that lightning was a kind of electricity.

2.   Lightning is a natural occurrence.

3.   Although lightning is unpredictable, it can and does strike the same place twice.

4.   But lightning can be a killer.

5.   But lightning has not been the worst of the problems this year.

6.   Ground crews are pulled off the tarmac when lightning is in the area and flying aircraft are diverted around the storm.

7.   He also showed that lightning is a form of electricity and that electric charges are always conserved in nature.

8.   Lightning is a way to relieve the built-up pressure.

9.   Lightning was visible there before dawn.

10.   Lightning is an electric charge trying to complete a circuit, and it seeks the shortest route to earth to do so.