Found this little list, hope they're not reposts:
The time difference between when Tyrannosaurus and Stegosaurus lived is greater than the time difference between Tyrannosaurus and now.
If you properly shuffle a deck of cards, in all likelihood, the resulting deck has never been seen before in the history of the world.
The bushes in Super Mario Bros. were just recolored clouds.
There is a blind guy who can ride his bike in traffic using echolocation.
There is a species of jellyfish that is immortal (turritopsis nutricula).
A small enough animal can fall at terminal velocity without suffering any injury upon impact. An ant (or even a smallish spider) dropped from a tall building will be just fine.
If you could fold a piece of paper in half 50 times, its thickness will be 3/4 the distance from the Earth to the Sun (71 million miles).
Over 3 billion people live on less than $2.50 a day (in USD using purchasing parity power), roughly half of the world's population.
There are more cells of bacteria in your body than there are human cells. (Indeed, there are more cells of E. coli alone than of human cells.)
Computer hardware has fulfilled Moore's Law for 40 years and may continue to do so.
The guidance computer from the Apollo 11 mission ran at 1.024 MHz, about 1/6th of the processing power of a TI-83 calculator, and it took human beings to the moon.
Humans landed on the moon, and it happened over 40 years ago.
When you see most stars, you're essentially looking hundreds or thousands of years into the past.
It takes a photon, on average, 200,000 years to travel from the core of the Sun to the surface, then just a little over 8 minutes from the Sun's surface to your eyeball, sliding in at 700,000,000 MPH.
If you cut up a hologram, the entire image is retained in each piece.
If Earth weren't tilted on its axis, we wouldn't have woodgrain, just "tree brown".
Boston Red Sox slugger Ted Williams missed almost five full baseball seasons (1943, 1944, 1945, 1952 and 1953) fighting as a fighter pilot in World War II and the Korean War and still managed to hit 521 home runs.
A pencil has the potential to draw a line 38 miles long.
It is unlikely that we are alone in the Universe.
It is likely we are alone in the Universe
[EDIT]....and my #1 most mind-blowing fact:
During metamorphosis, what happens in a cocoon is that most of the caterpillar gets dissolved by enzymes into a soup of undifferentiated cells and then the butterfly grows out of the same DNA.