Scientific facts that freak me out.

[Bucky Ball]

When I say "freak me out" I mean in a good way, in a "WOW" that is neat/weird/counter intuitive way. 

1. Color is in light, not objects. I accept it, but when I first learned this it freaked me out. 

2. If you could go as fast as the speed of light from your point of view you would be standing still. 

3. Time moves slower the closer you are to earth's surface and faster the further away. There is a calculable difference say being at the top of the Burj Khalifa building vs being at the shore of Miami beach. 

4. But I just learned this last night for the first time watching a short clip of Neil deGrasse Tyson's star talk. The bottom of your tire, even when your vehicle is in motion, is moving at 0mph. The top of your tire is moving up to 2x the speed of the vehicle itself. 

5. You could fit almost 5 billion of our suns in to the sphere of the largest known star(so far) UY Scuti. 

What scientific facts freak you out in a good way?

Re #1. The range (color) in  the spectrum of light which we see reflected from the object in due to the color or physical properties of the object. An object painted black reflects that range.
SO the way you phrase #1 is misleading.