| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Episode 401 |
July 13, 2021
PBS
|
26 | |
| S04E02 | Episode 402 |
July 27, 2021
PBS
|
26 | |
| S04E03 | Episode 403 |
August 3, 2021
PBS
|
26 | |
| S04E04 | Episode 404 |
August 24, 2021
PBS
|
26 | |
| S04E05 | Episode 405 |
September 7, 2021
PBS
|
26 | |
| S04E06 | Episode 406 |
September 14, 2021
PBS
|
26 | |
| S04E07 | Episode 407 |
September 29, 2021
PBS
|
26 | |
| S04E08 | Episode 408 |
October 12, 2021
PBS
|
26 | |
| S04E09 | Episode 409 |
October 26, 2021
PBS
|
26 | |
| S04E10 | Episode 410 |
November 3, 2021
PBS
|
26 | |
| S04E11 | Episode 411 |
November 16, 2021
PBS
|
26 | |
| S04E12 | Episode 412 |
December 7, 2021
PBS
|
26 | |
| S04E13 | Episode 413 |
December 14, 2021
PBS
|
26 | |
| S04E14 | Episode 414 |
January 4, 2022
PBS
|
26 | |
| S04E15 | Episode 415 |
January 19, 2022
PBS
|
26 | |
| S04E16 | Episode 416 |
February 1, 2022
PBS
|
26 | |
| S04E17 | Episode 417 |
February 15, 2022
PBS
|
26 | |
| S04E18 | Episode 418 |
March 1, 2022
PBS
|
26 | |
| S04E19 | Episode 419 |
March 22, 2022
PBS
|
26 | |
| S04E20 | Episode 420 |
March 29, 2022
PBS
|
26 | |
| S04E21 | Episode 421 |
April 11, 2022
PBS
|
26 | |
| S04E22 | Episode 422 |
April 26, 2022
PBS
|
26 | |
| S04E23 | Episode 423 |
May 9, 2022
PBS
|
26 | |
| S04E24 | Episode 424 |
August 29, 2022
PBS
|
26 | |
| S04E25 | Episode 425 |
June 7, 2022
PBS
|
26 | |
| S04E26 |
Episode 426
season finale
|
June 29, 2022
PBS
|
26 |
No artwork of this type.
No artwork of this type.
No artwork of this type.