Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
Japanese engineers were asked to redesign the front end of the Bullet Train because it carried enough speed to create a sonic boom whenever it exited a tunnel. Residents could feel the blast from miles away.
11
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Couples' personalities converge over time to make partners more and more similar.
235
If you get water flowing fast enough, it can cut metal.
354
No piece of square dry paper can be folded more than 7 times in half!
26
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
94