Summary
Mark uses a glowing powder and a blacklight to make invisible 'germs' visible, showing how quickly they spread by touch — and how handwashing stops them. A powerful, practical hygiene lesson.
Viewer safety
Ages 7+
Made for a general YouTube audience — an occasional mild or bleeped word can slip in, so preview if your classroom bar is strict.
Our rating is a quick teacher-to-teacher guide — preview before showing.
Teaching resources
Discussion questions
Talk about it
Germs move from hand to hand and surface to surface without us seeing them. Washing hands well removes most of them and breaks the chain of spread.
- How did the glowing powder help you 'see' how germs spread?
- Which everyday actions spread germs the fastest?
- Why does washing your hands well make such a big difference?
Quick work-a-long
Vocabulary: germs, spread, hygiene, handwashing.
Try it: Rub a little lotion with glitter on your hands and touch a few objects. Where did the 'germs' end up? Then wash and check.