How did you prepare a matchstick Stethoscope in your school?

How will you prepare butane?

How will you prepare isobutane?

How will you prepare an organic pesticide for your home garden with the vegetables available from your kitchen ?

How do you select a good place to plant a tree in your school / at home?

How do you select a good place to plant a tree in your school/ at home. Test the soil and investigate and write a report on it.

How do you prepare your own magnifier ?