A typical lead pencil can draw a line that is 35 miles long.
158
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
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Caffeine boosts memory.
405
Teddy bears were named after U.S. President Theodore 'Teddy' Roosevelt.
23
Author J K Rowling wrote the final chapter of the last Harry Potter book in "something like 1990", seven years before the release of the first book.
7
If you counted 24 hours a day, it would take 31,688 years to reach one trillion!
44
The first household refrigerators cost about $16,000, in today's money!
47