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The lesson "An Alien Hand" is written by Jayant Narlikar. The lesson narrates the story of Tilloo, a boy who lives beneath a planet's surface and his desire to learn more about an underground passage through which his father usually goes to work.
Some of the characters of the lesson are,
- Tilloo
- Tilloo's father
- Tilloo's mother
- Defence man
- Scientist
- Social scientist
- President
- Security staff
- People from NASA
- Narrator