It is what i mean. the end of april. still feels too soon to get the garden furniture out. lovely. the world s most powerful particle accelerator the large hadron collider will re open after three years of being shut down for improvements. do you remember how excited i was about that? you were, yes. scientists around the globe are hoping the upgraded machine will be able to detect new particles and start a physics revolution that could forever change our understanding of the universe. our science correspondent pallab ghosh reports. it s like a medieval castle. you have to have, like, winding roads to get there. deep underground, dr marcelo bono shows me into the heart of the large hadron collider. so this is the first time i ll have seen the detector. and, wow, itjust looks incredible. 7,000 tons of intricate engineering, built to detect minute particles