It's been 45 years since Mount St. Helens erupted — and scientists say it will erupt again in our lifetime. Johanna Wagstaffe breaks down what will make it different from the deadly blast in 1980 and how today’s technology is giving us an early warning system. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Follow CBC News on TikTok: https://bit.ly/3TnHioe Follow CBC