The main stories usually involve more research, so I imagine they're prepared well in advance. But it'll probably get covered in one of the shorter segments preceding the main story that pad out the running time (those don't make it on the official YouTube but I think they're more topical).
They do make it on the official YouTube if you are not in the US.
They publish the full episodes on YouTube for people that can't have access to them legally.
The main stories usually involve more research, so I imagine they're prepared well in advance. But it'll probably get covered in one of the shorter segments preceding the main story that pad out the running time (those don't make it on the official YouTube but I think they're more topical).
They do make it on the official YouTube if you are not in the US.
They publish the full episodes on YouTube for people that can't have access to them legally.