Misc: What does one square inch of human skin contain 625 of?

Questions

Former YES drummer Bill Bruford played with what group in 1972?

Formerly with spencer davis, he went on the form traffic with dave mason?

Fortymile creek was the location of what alaskan discovery in 1886?

Four thirds multiplied by pi multiplied by the radius cubed, gives you the volume of what geometric object?

what is the capital of idaho?