Friday links

October 21 is Trafalgar Day: history, videos, art and links.

Photo gallery: Carving Mount Rushmore 1927-1941

Scientists Figure Out Why Mozzarella Is the Perfect Pizza Cheese.

Animals who look as if they had a few too many

Trace The Remarkable History Of The Humble Pencil.

15 Towns With A Population Of 15 (Or Less).

ICYMI, Monday's links are here, and include instructions on tracking humans, Dave Barry's 1996 Halloween column, debunking the 5-second rule, photos and videos of ships vs big waves, and, for Rita Hayworth's birthday, an excellent compilation of her dancing.