This week we’re petrified.. petrified wood that is. Learn what it is and how it’s made - then we tie it all up with a fun paper about mathematical ways to tie neckties.

• AVE Clear Wood
• Wiki Petrified Wood
• Petrified Forest

• How many ways are there to tie a necktie? Find out in this week’s fun paper!
• Fink, Thomas M., and Yong Mao. “Designing tie knots by random walks.” Nature 398.6722 (1999): 31.