Pratibha Patil is the current President of India. http://en.wikipedia.org/wiki/India

Sweat consists mostly of water, but also contains small amounts of minerals, lactate, and urea. http://en.wikipedia.org/wiki/Sweat#Composition

Agnosticism is a belief that the existence of God or other spiritual deities cannot be proven and falls into the realm of the unknown. An Agnostic differs from an Atheist (though they are believed to be similar by some) as an Atheist believes there is no God, while an Agnostic believes there is no proof or evidence either way. http://en.wikipedia.org/wiki/Agnosticism

Smith Island cake is a traditional dessert specific to Smith Island, Maryland. It's a layer cake with 8 to 10 layers, separated by frosting. Chocolate frosting on yellow cake is the most common, but coconut, banana, fig, and strawberry flavors are also popular. http://en.wikipedia.org/wiki/Smith_Island,_Maryland#Smith_Island_Cake http://www.marylandtraditions.org/smith.htm

The strongest bone in the human body is the femur, or thigh bone. The hardest is the temporal bone, found around the inner ear. http://en.wikipedia.org/wiki/Femur http://en.wikipedia.org/wiki/Ear#Inner_ear:_cochlea.2C_vestibule.2C_and_semi-circular_canals