According to relativity theory, you can experience a longer youth when you
A) are near a black hole.
B) are near a very large gravitational field.
C) travel at nearly the speed of light.
D) all of the above
E) none of the above
Question 2
Strictly speaking, the ratio of circumference to diameter for a circle equals as we know it
A) in flat space.
B) on a spherical surface.
C) on a saddle-shaped surface.
D) all or any of the above
E) none of the above