137 – Jack and Hao make a spreadsheet! It has three columns: things where you must kill something, things where you might kill something, and things where you won't kill something. We also tackle interesting physics problems, like dropping a knife from an airplane that's turned off its engines.

Plugs this week:

• Busking (Jack)
• Donating so much money to a charity that they have to name a building after you (Hao)

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