YouTuber, Mark Rober has posted a video showing visually how quickly germs spread among us.
You probably know this guy from the epic Glitter Bomb package video from back around Christmas. He's back with another crazy video showing how germs spread.
In the new video, he uses an invisible powder to simulate and track the spread of germs around a school classroom. He starts off the video by putting the powder on the teacher's hands. She shook the hands of three kids on the way into class. By lunchtime the germs were spread all over the classroom.
Take a look at the video above.