Episode 1 (S4E1)
9/5/2019
Episode 2 (S4E2)
9/12/2019
Episode 3 (S4E3)
9/19/2019
Episode 4 (S4E4)
9/26/2019
Episode 5 (S4E5)
9/26/2019
Episode 6 (S4E6)
10/10/2019
Episode 7 (S4E7)
10/17/2019
Episode 8 (S4E8)
10/17/2019
Episode 9 (S4E9)
10/24/2019
Episode 10 (S4E10)
10/31/2019
Episode 11 (S4E11)
11/14/2019
Episode 12 (S4E12)
11/21/2019
Episode 13 (S4E13)
11/28/2019
Episode 14 (S4E14)
12/5/2019
Episode 15 (S4E15)
12/5/2019
Episode 16 (S4E16)
12/12/2019
Episode 17 (S4E17)
12/12/2019
Episode 18 (S4E18)
1/16/2020
Episode 19 (S4E19)
1/16/2020
Episode 20 (S4E20)
1/23/2020
Episode 21 (S4E21)
2/6/2020
Episode 22 (S4E22)
2/6/2020
Episode 23 (S4E23)
2/20/2020
Episode 24 (S4E24)
2/20/2020
Episode 25 (S4E25)
2/27/2020
Our hominid ancestors (S4E26)
3/12/2020
Episode 27 (S4E27)
3/26/2020
Episode 28 (S4E28)
4/9/2020
Episode 29 (S4E29)
4/16/2020
Episode 30 (S4E30)
4/23/2020
Episode 31 (S4E31)
4/30/2020
Episode 32 (S4E32)
5/14/2020
Episode 33 (S4E33)
5/21/2020
Episode 34 (S4E34)
6/11/2020
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