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Question: What's the best invention since sliced bread?

My Answer: I was tempted to say the Wonder Bra™ as a joke, and I guess I just did, but I doubt most people would actually take it as a joke. In short, I don't know that I've got a real answer. The telephone, perhaps, may have provided the most value. It's universal, and it's now wireless and very small. So I'll go with "the telephone is the best invention since sliced bread."

You are encouraged to answer the Question of the Day for yourself in the comments or on your blog.