Interactive periodic table
There's just something about the periodic table of elements that summons up pleasant geekly nostalgia. I remember my first real brush with The Table back in 10th grade chemistry. I had always wondered about this mysterious poster that adorned most science classrooms I had ever seen.
This poster had it all: Mysterious numbers in various corners, each one hinting at some deeper esoteric scientific purpose. It had a comforting structure and order, somehow arranging the chaotic diversity of elements from neon to uranium into a regimented array of perfect little squares.
The periodic table was also a fertile source for memory-based flashcard learning around. Memorizing the elements is a rite of passage and a fun one at that. Pb = lead, H = hydrogen, Ne = neon, Am = "....ammonia...no...Americium!"
It was a gateway to the exotic. I was always most fascinated by the bad-boy, outlaw elements in the bottom rows of the table. Sure, the noble gasses had a certainly regal glow about them, but the crazy radioactive, recently discovered elements really got the mind going. I always imagined them pulsing with a soft green glow of deadly, insect-enlarging radiation.
But, alas, the periodic table fades to irrelevance for adults. Like the history of the pilgrims or of the laundry list of the presidents, it is pretty much exclusively used by school children, then quickly forgotten. Take a few minutes to get acquainted with your old friend the periodic table.