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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This video is taken during whale watching tours with North Sailing in Húsavík in spring 2017. Mars, April and May are great for whale watching in Húsavík. You can enjoy the arctic sunlight, see humpback whales and even the mighty blue whale! Welcome to Húsavík, the whale capital of Iceland. Book your whale watching tour on www.northsailing.is

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Woke up like this 💨⛵️

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The Sticky Waterfalls are a must-visit place near Chiang Mai. Tours are offered as a half-day trips, or a full-day, combined with a hike, or an elephant farm visit. Definitely worth the trip. Very refreshing. No place to swim, but a great escape from the heat. To see the “Do not climb” sign, you have to climb to it.

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