(CNN) There's been another terror incident in London. Here's what you need to know to Get Up to Speed and Out the Door. (You can also get "5 Things You Need to Know Today" delivered to your inbox daily. Sign up here.)

1. London train explosion

JUST WATCHED Bucket of fire spotted on London tube Replay More Videos ... MUST WATCH Bucket of fire spotted on London tube 00:54

2. North Korea

JUST WATCHED How much damage can North Korea's weapons do? Replay More Videos ... MUST WATCH How much damage can North Korea's weapons do? 01:04