We can see them after a sun shower... or the spray of the sprinkler... we can even sing them! But why can't we ever catch them? Nij shares the ingredients to make a rainbow in this special episode of Imagine This...

Family trees have so many branches. You're on one branch, your parents on another, your grandparents on another and great grandparents after that... Could it go all the way back to the first person? Let's ask archaeologist Associate Professor Michelle Langley about how humans came to be...