I will guess 89.9 kilograms and I wish you all the best in your quest to meet your weight loss goals!
I see you mentioned Wolfram Alpha in your post. Did you happen to read A New Kind of Science? Now he's doing some interesting research into a "theory of everything" in Physics. He's always doing something exciting!
Oh, I forgot Wolfram Alpha was one person's work. I don't know about the science, but I like his approach to the philosophy of free will: