Well those wacky physicists are at it again. Using super accurate optical clocks, which “tickle” single aluminum ions in an elaborate trap, they have measured differences in the passage of time just 1 meter apart in the earth’s gravitational field. Effectively this means that your head is experiencing time faster than your toes. Granted over an average lifetime the difference is less than 100 picoseconds, but it is remarkable that scientists can make such precise measurements!
The original story is here.