Titanium is used in building spacecraft, but today it is also lending its strength and flexibility _ along with its mystique and high cost _ to far more terrestrial objects, from eyeglasses to jewelry, from clocks to pry bars.
12.
I'm just wondering, what is the colour of the average clear sky on Earth during the middle of the daytime " excluding " the colour of the sun and clouds and moon and dark areas and haze and terrestrial objects and aircraft and contrails and lightning and halos and all other objects'colours in the sky other than the average colour of the daytime sky itself, in HTML?
