Answers

2014-02-23T18:27:15+05:30
I think as far i know a folding portable ladder hinged at the top.
0
Related to lightning
oh that's different that step leaders are paths of ionized air stemming from a cloud.
2014-02-26T05:55:39+05:30
The initial streamer of a lightning discharge; an intermittently advancing column of high ion density which established the channel for subsequent return streamers and dart leaders.

0