Now, I know what you're thinking: "But what about the science behind it all?" Well, let me tell you, it's all about the fat molecules. You see, when you whip heavy cream, the fat molecules get all excited and start to coalesce, creating a stiff and stable foam. Half and half, with its lower fat content, just can't keep up with the whipping demands, resulting in a more soupy consistency.
That being said, if you're in a pinch and need to make a substitution, you can try using half and half, but be prepared for a different texture and consistency. You might need to add some extra stabilizers, like gelatin or cornstarch, to help things along. And don't expect the same level of fluffiness you'd get with heavy whipping cream – it's just not going to happen, folks.
Now, I'm not here to be the cream police, so go ahead and experiment with half and half if you want to. Just don't say I didn't warn you... Your dessert might not be the most stable thing in the world, but hey, at least it'll be interesting. And who knows, you might just accidentally invent a new dessert sensation – Half-and-Half Horror, anyone?