That's right, Foxy. One of the best skills kids learn in math class is how to estimate, that is how to eliminate impossible answers and narrow down the possible choices. So, even if the kid does not know the exact answer to:
Solve for a in 2a+2 =12,
they do know that the answer cannot possibly be "3,794" or "the rings of Saturn" or "the Beatles"!
If not knowing the correct answer means that you have to entertain just anything, including all supernatural entities and magical powers, we wouldn't be able to do science at all.
In 1985 nobody knew what caused AIDS. So, according to skeptic, it was therefore equally likely that AIDS was caused by a germ or virus, or by unicorn dandruff, or by my Aunt Sally's Psychic Witch Potion, or by demons from Chinese mythology, or by invisible aliens from across the 8th dimension or by magical poison apples from Snow White. How much research funding would you put towards each of these, skeptic? All are equally likely and none can be ruled out, right?
Throwing millions of bucks towards protecting people from witches and stopping Chinese demons, instead of investigating a virus or germ, would have meant AIDS would still be an automatic death sentence for babies in poor countries today. Because of real science, millions of kids will be able to grow to adulthood, in spite of having the AIDS virus. Thank you, real science. Hopefully, scientists will keep ignoring people like skeptic, even when they are famous, well-funded or popular tv stars.