We all have bad memories that we would prefer to forget. But can science actually help us delete specific unwanted memories? New research suggests it could be possible.
Rob and Finn discuss the research and explain some words relating to the brain.
This week's question:
How many neurons do scientists think we have? Is it:
a) 8-10 million
b) 8-10 billion
c) 80-100 billion
Listen to the programme to find out the answer.