Through the detection of rapid eye movement we can tell precisely when someone is dreaming, and using brain imaging technology we may even be able to view your dreams one day.
We also need to consider our definition of extra-terrestrial life, because even though NASA predicts we may find something in next two decades, it's likely to be in the form of miniscule organisms that aren't really capable of holding conversation.
If you're watching this video you're probably conscious. If someone hits you with a baseball bat you'll be rendered temporarily unconscious. And if they hit you a few more times before burying you in a shallow grave in the woods you'll be permanently gone from this world.
It is often said that we know more about space than we do the ocean, and whilst this is hardly something you can accurately measure it is true that we have a huge knowledge gap when it comes to the Earth's soggy bottom.
Ever since Pluto was given a dishonourable discharge for being too small and puny you may think the answer to this is simple, eight. Or seven if you believe the conspiracy that Venus is a secret fiery death star waiting to annihilate us all.
Unless you're a certifiable moron you know that to make a bicycle go forward you get on it and pedal real hard, but in terms of the actual physics involved in making a bicycle stay upright, scientific opinion seems to disagree with itself with every passing week.
Do you know your own blood type? If not there's a very easy way you can find out. Simply extract two litres of blood, walk to your nearest Starbucks, drink the blood in front of the barista, and when you wake up in the hospital just ask the nurse.