Using tear gas is a common tactic authorities use to control crowds at protests, and it can have lasting affects on your health. Before you head out to a protest, learn what to do if you encounter it.

Police have made heavy use of tear gas to break up the ongoing protests in Ferguson, Missouri. Tear gas is effective at dispersing crowds because its key ingredient — called ...

The bicep is a muscle on the front of the upper arm. Tendons attach the bicep to the bones in the arm and help it function. A bicep tear refers to tendon damage, which can cause pain and affect ...

What you hear first is the pop of deployed flash-bang grenades and the clang of canisters hitting the pavement. A cloud of white powder unfurls, sparking widespread panic through crowds. When tear gas ...

Across the United States, as marches over police brutality and the murder of George Floyd have grown in size, protesters have encountered volleys of tear gas. It’s clear that all protests—peaceful and ...

What is tear gas? Learn more about the evolution of tear gas and why some scientists recommend a revaluation of its use. Tear gas is a chemical weapon also known as “demonstration control agents” ...

A retinal tear is a small split or hole in the lining of the back of the eye. The condition is not painful and may not damage a person’s eyesight. However, a torn retina can progress to a retinal ...

Your eyes may water when you yawn because facial muscles tighten and press tear glands. Excess tears can spill out when your eyes scrunch closed. Frequent tearing during yawns can also be linked to ...

Tiny passages called tear ducts run down the sides of your nose and drain tears from your eyes. These tubes can get blocked in any part of the duct. It can happen for different reasons, including the ...