Small doses disinfect, but large chlorine quantities are deadly to humans.
A team of chemists and microbiologists has put a new spin on a type of photography: a small‑scale spin, to be precise. They photograph bacteria!
If you’ve ever seen movies about World War I, you know that the soldiers in the trenches often wore bulbous gas masks that made them look like human insects. The masks were necessary to protect them from chemical weapons such as chlorine gas, a noxious substance that could almost instantly suffocate unprotected victims.
Why can’t leaves change colors, stay on their trees, and change back to green again when spring comes?