"When did people stop using their father's first name or their town as their last name, like 'Robert John's Son,' or 'Thomas of Bridge Town,' and start using the same last name as their whole family like we do now?"
"Can you visit the exact spot where Lewis and Clark first saw the Pacific Ocean?"
"Who was on the first American dollar?"
"Does the Earth's elliptical orbit make summer longer in the Southern Hemisphere?"
"Did George Washington ever watch fireworks on the Fourth of July?"
"Do lithium and beryllium bond together to make a new chemical?"
"Oxygen has a heavier atomic weight than nitrogen. Does that mean that nitrogen floats on oxygen? Is there a higher concentration of oxygen compared to nitrogen the closer you get to the surface of the Earth?"