Before demonstrating magnetic levitation this video shows a small magnet being cooled to a superconducting temperature using liquid nitrogen. Once cooled the superconducting magnet is shown performing magnetic levitation above a section of magnetic track as seen in the featured image.
Further in the video the magnet is kept longer at superconducting temperatures by building a container of liquid nitrogen around it. It is then seen being whizzed along by hand while levitating above, clinging to the side and hanging below, a Möbius strip track plastered in neodymium magnets.
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This post contains instructions on how to avoid spilling juice from cartons or Tetra Paks®, with a rectangular cross-section, while opening or lifting them. It’s quite natural to grip cartons by the easiest method (the broad sides) while opening them, or lifting them when they’re still full, causing the contents to pour or squirt out inadvertently. Cartons with a square cross section are indifferent to the sides that are gripped when lifting or pouring.
You go to the refrigerator and take out a new cool carton of juice. You hold it firmly and take off the seal and juice spurts out at you and runs down the side of the carton, or you pick it up after removing the seal and juice pours out as you grip it. Before you’ve got it in a glass you’re in a mess. This is usually caused by the way you grip the carton.
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