Famous experiment. Identify.

Hint: The “container” at the bottom is exploding.

Theme round question 2.

Rogi got very close to cracking the theme.

Cracked by: raklodramA, badideabear, Sumanth Patlolla, Ananth, Manish Achuth, rickde, KK, kazkas, Logik, jowens, Anjul, Mayukh Bose, Bharath, Amarendra Kumar, Shwetha Maiya, rohanquizzer, Gurupad, Rogi and Teju