What is Dunbar's 150-person social circle rule?

Episode 688: Neal and Toby recap the staffing shortage that is stifling air traffic control causing flight delays across the US. Then, renewable energy surpassed coal for the first time as a source of electricity. Also, the WNBA just tipped-off its Finals, but everyone is still thinking about the conflict with its leadership. Meanwhile, Neal shares his favorite numbers on Cristiano Ronaldo, Carrie Bradshaw, and if he actually has 150 friends in his social circle. 

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