Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). Edited from to 1/4th normal speed. I didn't quite understood the need for a razor blade but without one I still see the flow of air. For me, the razor blade just makes the dot of light smaller(?) If anyone can clarify me what the razor blade really does and where it should be placed (in the source of light or in the camera) I'd really appreciate. Also important to note that this is AWESOME to look with the naked eye but almost the dimmest light can blind you. I covered a tiny LED torch with aluminum foil and punctured a hole with a sewing needle, on the side! so that the LED doesn't bright directly through the hole. Take care with the eyes!!

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Cunard liner Queen Mary 2 departs docks #cunard #queenmary2 #cruise #cruiseship #cruising #southampton #docks #liner #shorts

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The James Bond Cave, also known as the Thunderball Grotto in the Bahamas was fascinating! Full of fish, beautiful rock formations, and clear water. Tips: - Go in the AM to avoid tourist (we did not) - Don't forget your fins, or you will have to pretend to be the little mermaid (which is fun for 2 minutes). I forgot - Definitely don't forget your good underwater camera. I learned.

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