Watch this kid show his dad how to make Leonardo da Vinci’s self-supporting bridge.
How Nestlé Makes Billions Bottling Water It Pays Almost Nothing For.
It's the first day of Fall - autumnal equinox science, videos, poetry, music.
The book wheel: A rotating reading desk for 16th century, perfect for those "tormented by gout".
ICYMI, Wednesday's links are here, and include Alexander Graham Bell’s tetrahedral kites, the 1869 near-war between the United States and Britain, and Joshua Norton, Emperor of the United States.