I'm not sure what is meant by impactful, but for me the most interesting podcasts this year have all been miniseries, namely
* 13 Minutes to the Moon (13 episodes) - a documentary about the 13 minutes leading up to the first moon landing
* The Drop Out (8 episodes) - a documentary about Theranos/Elizabeth Holmes
* The Missing CryptoQueen (10 episodes) - a documentary about the OneCoin scam and how far it has reached, along with the disappearance of its founder.
In terms of stand out episodes:
* Supernova in the East III (Hardcore History) - a continuation of the 'Supernova' series, I recommend listening to the first 2 though.
* 13 Minutes to the Moon (13 episodes) - a documentary about the 13 minutes leading up to the first moon landing
* The Drop Out (8 episodes) - a documentary about Theranos/Elizabeth Holmes
* The Missing CryptoQueen (10 episodes) - a documentary about the OneCoin scam and how far it has reached, along with the disappearance of its founder.
In terms of stand out episodes:
* Supernova in the East III (Hardcore History) - a continuation of the 'Supernova' series, I recommend listening to the first 2 though.