What is it we cannot see, hear, touch or smell; that we all have to live with and is so old it was around before the world was created? The answer is of course TIME. Tick-Tock takes us on a journey from counting out seconds in heartbeats, to measuring time with clocks and calendars. Discover how we can sense time is passing, and find out some of the amazing things that happen as time ticks on and on and on... The Wonderwise series presents facts in a way that will inspire young children's imaginations about the world around them.