Bears Can Swim, Can't They?
Without ever touching the equator, a bear somewhere in the Northern Hemisphere takes off towards North and travels straight without turning or curving for a great distance. Then he makes a 90 degree left turn and again travels straight for a great distance. Then he makes another 90 degree left turn and once again travels straight for a great distance. He finds himself right back to where he started from. What color is the bear?
Curving over the round Earth is okay, if the bear is to go anywhere. Just not curve left or right as he goes straight.