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### Course: Breakthrough Junior Challenge > Unit 3

Lesson 1: 2019 Challenge — Finalists- Cryptography: The RSA algorithm
- DNA 2: Electric Boogaloo
- Neutrino astronomy: a new frontier
- Gravitational waves
- Moment of inertia
- Quantum levitation
- Boltzmann's entropy and arrow of time
- Photosynthesis, the quantum magician
- Immune checkpoint inhibitors
- Chariklo belt formation: a simulation study
- A brief introduction to integral calculus
- Optogenetics
- Everything you need to know about time travel
- Stress
- Hawking radiation
- Telomeres

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# Boltzmann's entropy and arrow of time

By Aditya Joshi. Country: India. Finalist, India Region Champion: 2019 Breakthrough Junior Challenge.