react

How do you react to that?

And since luminol will react even if the blood is extremely diluted, it's almost impossible to clean a bloody crime scene well enough to prevent chemiluminescence.

Not only does luminol react to very old bloodstains, with some cases showing chemoluminescence on objects thousands of years old, it can also react to cleaning agents like bleach or materials containing copper.

Animations alert pedestrians but are not suitable for runners and cyclists, who are travelling too fast to react.

If you're looking at the world in more positive ways, you're taking information in, so you're reacting to it in positive ways.

And that puts scientists, political leaders, and our whole society in the pretty tricky position of having to react to something that hasn’t actually happened yet.