Riddle: It goes up, but at the same time goes down. Up toward the sky, and down toward the ground. It's present tense and past tense too, come for a ride, just me and you. What is it?
Riddle: Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?
Riddle: Double my number, I'm less than a score, half of my number is less than four. Add one to my double when bakers are near, days of the week are still greater, I fear.
What am I?
Riddle: We capture light, and yet we don't. We reflect rays of sun, and yet we don't. Without us all the world is gray and dull for everyone.
What are we?