26Royal coat of arms
The reason why the unicorn on the UK's royal coat of arms is chained, but the lion isn't, is that according to legend a free unicorn was a very dangerous animal.
27. A stowaway named Kiddo the Cat became the first feline to attempt to cross the Atlantic in an airship. His eventual howling led to chief engineer Melvin Vaniman making the first radio message from an aircraft in flight: “Roy, come and get this ---damn cat.”
28. Alexander Grothendieck, the greatest mathematician of the 20th century, became obsessed with the devil who he thought orchestrated any turmoil in the world. One such conviction was that Devil corrupted the numerically beautiful speed of light, from 300,000 km/sec to the irrational 298,779 km/sec.
29. Old books smell like vanilla due to the decomposition of a class of organic polymers called lignin into vanillin.
30. In 1930, the Indiana Bell telephone company shifted its eight-story Headquarters in downtown Indianapolis 152 feet and rotated it 90º over 34 days without interrupting any services in the building.
