How 3D Printing can make visualizing a geometrical proof so much easier. One of Archimedes' proofs showed that a sphere that fits exactly inside a cylinder fills two thirds of its volume. Elizabeth Slavkovsky and Oliver Knill of Harvard University printed a hollow hemisphere supported above a cylinder which contains a cone that takes up one third of the cylinder's volume. Fill the hemisphere with water and it drains into the cylinder, filling it exactly to the brim. #Math #3D_Printing
Heartbkr: Perfect for your fittest, green-minded friends and significant others. 500ml glass water bottle with a silicone sleeve, gasket, and food grade polypropylene cap. FDA approved, BPA-free, BPA replacement free, phthalate free. Fits most cup holders, doesn't leak, lightweight, 100% reusable and recyclable! Thanks to @Elizabeth Silbermann! #Water_Bottle #Heart #Bkr
To remove old paint from hardware easily.