This fun hands-on discovery activity will inspire creative thinking and problem solving. Great to use in a geometry or trig class. Also can be used for a Pi Day activity. Students need to know the formula for the circumference of a circle and will consider this question: "If a string was wrapped around the earth so that it fit snuggly, then 1 yard (36 in) was added to it (and it “hovered” above the earth), there would now be enough space for which of the following animals to crawl underneath?" This activity provides an excellent opportunity for students to employ the Eight Mathematical Practices for Common Core!