Traveller whose Head goes Further than Feet

Problem

A traveller sets out on a journey,

and eventually returns to the place where he started.

During his journey, his head has travelled $12$ yards further than his feet,

and yet his head remains attached to his body.

How is this possible?

The traveller went around the world, at the equator.

Let the radius of Earth at the equator be $R$.

Thus, by Perimeter of Circle, the equator measures $2 \pi R$ all the way round.

Let the height of the traveller be $h$ yards.

Consider the equation:

$12 = 2 \pi \paren {R + h} - 2 \pi R$

Thus we have:

$h = \dfrac {12} {2 \pi} \approx 1.91$

So, if the traveller:

were $1.91$ yards, that is, approximately $5$ feet $9$ inches tall

and walked the entire way around the world, along the equator,

his head would have travelled $12$ yards further than his feet.

$\blacksquare$