There are a few good websites to use if you want to create a timeline, but one of the nicest is Preceden. A basic account is free, but you should know that timelines are viewable by the public. Timelines are interactive and can include media.
And now… math in action (literally). Mindshift has a great article about how one fifth grade teacher blended math and dancing to teach about patterns.
Proving that you can find beauty in anything, Professor Gary Greenberg invented high-definition, three-dimensional light microscopes that he uses to take unbelievable photographs of the most mundane of subjects…sand. Viewed – and photographed – through Dr. Greenberg’s invention, sand becomes a real work of art. View his gallery here.
Happy Tu B’shevat! Per the Open Siddur Project, The first ever published seder for Tu Bishvat — Pri Etz Hadar (The Fruit of the Majestic Tree) — can be found in a kabbalistic text, first published as a pamphlet in Venice in 1728. The first three sections have been translated. Go hug a tree!