What percentage of air is composed of oxygen?

More Questions:

When did college basketball introduce the 3-point shot?

What London street is home to a famous theater and, in a children's song, to "the Muffin Man"?

What process does milk undergo to become yogurt?

European bees were bred with bees from what other continent to create "killer" bees?

The scientific unit named for Sir Isaac Newton measures what?

According to their own theme song, what 1960's group was "too busy singin" to put anybody down"?

What 1978 movie inspired toga parties on college campuses?

Who was nicknamed "Hanoi Jane" after she toured North Vietnam in 1972?

What character is best known for their phrase "What's up, Doc"?

What year marked the appearance of Betty Boop?

After his trial, Michael Jackson fled Neverland Ranch for what island nation?

Where was US President James Garfield shot and killed?

In which battle was Horatio Nelson killed?

What war lasted from June 5 to June 10, 1967?

Who recorded the albums "Non-Stop Erotic Cabaret" and "The Art of Falling Apart"?