No, no offense taken! You might find that a lot of us listen to audiobooks rather than podcasts, though, as places like the NLS/RNIB/CNIB offer them to us for free. But personally, I subscribe to around two hundred podcasts, so maybe you ended up in the right place after all. :-)

If you enjoy audio drama, I highly recommend the $1. Every week it's something different, from a wide variety of genres. Not every drama is a winner, but each episode is a stand-alone drama, so if you're not enjoying one, just skip it. Speaking of audio drama, you might be interested to know that /r/audiodrama is an active place where people post knew episodes of audio dramas, share recommendations, etc.

Also, if you enjoy science fiction, I'd strongly advise you to check out $1. While they do have a podcast, it's usually actor interviews and so-on. However, the audio dramas they offer for purchase, while they're quite expensive, are some of the best acted and produced science fiction audio being made today. If you enjoy DR Who, the monthly series is worth the money.

If you like radiolab, you'll probably also enjoy $1. It has a similar sound, and a similar variety of topics. If you're up for something a little more in the style of standard science radio, $1 is also worth a listen.

Unfortunately, another good explorational podcast I enjoyed seems to just be gone; I have no idea when or if season two of $1 will happen. The five episodes that exist are still good listening though, if you're up for something a little different. This is one of those podcasts where the host, Starlee Kine, makes the show. Those topics, in that format, couldn't work with any other presenter, I don't think.

The makers of The Mystery Show also make another podcast I enjoy called $1. Unfortunately, the quality of episodes varies widely. If the topic of the episode seems uninteresting to you, don't be afraid to skip it right off! The latest episode (number 82, "hello?") for example is just a silly gimmick that makes terrible listening. However, most of the episodes are much, much, much better.

Those are a few to get you started! Most of the other podcasts I listen too are specialized to particular topics like Canadian news/politics, tech discussion, fandoms, bitcoin, or blindness, so I don't think you'd enjoy them much.

Sighted reader, but I love me some podcasts. For the specific genres you mention:

**Science**

$1 What does science have to say on a particular subject. They just recently did one on Forensic Science which you would probably be interested in.

$1 A Comedy/Science podcast. The hosts take a science story as a starting point and do improv. Short 20 minute episodes.

**Science Fiction**

$1 This was sold to me as Serial meets The X Files.

$1 Only one season not ongoing, but a pretty good story.

$1 I haven't listened yet but from the description: "A new psychological thriller from Gimlet Media, starring Catherine Keener, Oscar Isaac, and David Schwimmer."

**True Crime**

$1 I'm sure you heard this one, but just in case.

$1 Two comedians talk about true crime. The tone is more about like telling your friends a true crime story rather than it being presented dramatically, but you might like it.

$1 Each season is about a different cold case. Season 2 just started.

$1 Show about the Boston Strangler

$1 Producers of The Jinx on HBO (which you absolutely should watch) bring a show about organized crime in Providence, Rhode Island.

Hi, I'm visually impaired and I don't think you're being presumptuous at all. If we didn't do audio, the only other options to entertain ourselves would really either be sports or drifting off into space, and I don't think either really suit my fancy as prospective hobbies, just imo.
Anyway, to answer your question, right now I mainly follow Pain Killer Already (PKA) but it's definitely not content for everyone and I'd imagine it's also a really difficult one for new listeners to get into. Other podcasts I've followed include the Joe Rogan Experience, RAWTalk (a photography-Centred podcast that occasionally discusses business), and I think one that'd suit your preferences would be the How Stuff Works podcast.
Hope I got the names right there, it's late here and I can't be bothered to check. Please don't crucify me if I spelt something wrong, heh

/u/fastfinge /u/HalfBlindMe /u/JackEsq and other users:

Where do you get your podcasts from? I have been using iTunes as I am an iPhone user and I'm definitely not super attached to it. I know there are other platforms such as SoundCloud but I'm even less in love with that one thus far. I recognize it's personal preference and obviously accessibility influences that for most on this sub, but I am curious.

Edit: word.