When the astronauts went to the Moon they left behind a reflector
so we can measure the distance with incredible accuracy. Using
simple ideas, simple maths, and a whole lot of clever thinking,
we can measure how far away the Moon is from a closed room, using
nothing but a stopwatch, a pendulum, and a lot of clever thinking.

The talk culminates in the actual measurement. When given as a
workshop the equations are derived, and then the workshop attendees
themselves make the measurement. Then we can gather the data and
look at the spread of results, asking the question  where does the
variability come from? In this way we can explore many questions
that arise in real life.
