The Dailies

Word of the Day

Phronesis (n., fro-KNEE-sis)

A specific type of intelligence that's more concerned with how to apply wisdom to practical things, in a way that helps to encourage good character. For example, if you have a lot of phronesis, you would understand that there is no good time to make a "hooked on phronetics" joke.

Gif of the Day

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Link of the Day

How the Sydney Opera House shells were designed

An interesting little story about how the famous Sydney Opera House shell design came to be:

When architect Jørn Utzon submitted his plan for the Sydney Opera House, the shapes of the roof vaults were not defined geometrically. Without this information, engineers couldn’t calculate the complex forces and strains involved and make a plan for construction.

The team spent three years and hundreds of thousands of working hours trying to define the shapes as paraboloids and ellipsoids. Finally, in 1961, they realized that all the half-shells could be cut from the surface of a common sphere (below). This would lend a visual harmony to the whole complex and, since a sphere’s curvature is the same in all directions, it would permit the materials to be mass-produced.

“Each half-shell is now a spherical triangle,” explains University of Sydney mathematician Joe Hammer. “One side of the triangle is the ridge that is part of a small circle of the sphere. The other two vertices of the triangle are on the ridge. Each side shell is also a spherical triangle, the boundaries of which are small circles of the common sphere.”

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