What is the smallest particle?

What is the smallest particle of matter? How does radiation affect our bodies? And, how is particle physics useful in our everyday lives? CrowdScience takes on particle physics questions from listeners all over the world. Marnie Chesterton and Anand Jagatia get help from particle physicists from the Large Hadron Collider at CERN and medical physicist Heather Williams. Presented by Marnie Chesterton and Anand Jagatia Produced by Cathy Edwards, Jen Whyntie and Louisa Field (Photo: Particle collider, Credit: Getty IMages)