While at high school, I used to be a Periodic Table geek—whatever that is. I could (well, still can) write the periodic table; I have a problem remembering the Lanthanides and Actinides, though. I even had some web pages about periodic tables and stuff—can’t find them online now, though.
"There is an interesting article on the periodic table over at Slate: 'Oxford ecologist Philip Stewart has designed a new periodic table of the elements, and it's a hit. American schools are placing orders daily for Stewart's table, and the Royal Society of Chemists recently sent a copy to every British secondary school. Stewart's is the only remake to achieve widespread adoption since Dmitri Mendeleev invented the original periodic table in a fit of brilliance in 1869.' "