Google sometimes lets you ask follow-up questions when a search doesn't provide all the answers. Bing, however, has required that you phrase each query as if you're starting fresh -- a bit of a headache if you're the curious sort. That won't be a problem for much longer, as Microsoft is rolling out a Bing update that adds conversational, context-aware searching to the mix. If you ask who President Obama's wife is, for example, you can then ask "how tall is she?" (spoiler: fairly tall) without having to mention Michelle by name -- the engine knows who you're referring to. The feature doesn't appear to be available everywhere just yet, but it shouldn't take long before you're holding short chats in your web browser.