Each of these grew out of the Towne Crier board, and each is open to anyone, with no signup and nothing to install. The Towne Crier board isn't offered to fire, police, EMS or dispatch agencies.
A split-flap periodic table: all 118 elements with photographs, spectra, crystal cells, cosmic origins, their roles in life and medicine, and who mines and trades them.
A split-flap molecule gallery: rotating 3D models of 343 molecules and crystals, from the air we breathe to vitamin B12, with what each one is, where you meet it, and how ChEBI classifies it.
Route 215 on a full map: each bus with its heading and next stop, live where Metro reports its position, plus the next times at the landmarks and Metro's service alerts.
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