The arXiv page for recent preprints in dynamical systems.
Marcelo Viana's website, including many of his books.
I have been practicing Kendo (剣道, a traditional Japanese martial art, meaning "the way of sword") for over 15 years and is currently third dan (三段). I am a member of All United States Kendo Federation (AUSKF). I am also a certified referee for the International Kendo Federation (FIK).
My sensei (instructor) is Fumihide Itokazu, a member of Team USA for the 12th and 13th World Kendo Championship. Here is the video of the 13th WKC when USA defeated Japan in the semi-final (and unfortunately lost to Korea in the final).