October 31, 2008

Catenary

Supported at each
end, a hanging cable forms
a catenary.

October 30, 2008

Tallest mountain on Earth (base to summit)

Mauna Kea is
Earth’s tallest mountain, measured
from base to summit.

October 30, 2008

Tallest mountain on Earth (above sea level)

Mt. Everest is
the tallest mountain on Earth
above sea level.

October 28, 2008

Complement of a set

A set’s complement:
everything not in the set
but inĀ its domain.

October 27, 2008

Speed of sound

Sound travels faster
in liquids and non-porous
solids than in air.