Space X Rocket Explosion
Fortunately no one was killed or hurt. That's the good news. The bad news is this is a setback for Space X and the future of space flight. It won't stop future rocket launches by Space X, but no one likes to see a failure such as this as it results in delays and extra expenses that were not anticipated.
Scientists and investigators have yet to determine the exact cause, but what this does point out is how hard it is to launch something into space. You can't just build a rocket in a few days and successfully launch it. It take decades of research to design and launch successfully. Even then there are still unexpected things that pop that may cause a failure. Maybe one day humans will find a 100% failure-free method of launching something into space, but we are far from that day. Until we reach that day we have to do our best and put in every fail-safe possible. As John F. Kennedy once said, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."